An easy-to-understand guide for small business owners, without technical jargon
You’ve no doubt come across this before: when downloading a programme, you’re asked to choose between the ‘32-bit’ and ‘64-bit’ versions. Or perhaps your computer technician told you, “This machine is still 32-bit – it’s time to upgrade.”
At first glance, this seems like a technical detail that a business owner doesn’t need to worry about. Today, however, the security of your company’s data, invoicing and customer information depends on it.
In this article, I’ll explain the difference between the two, why it matters, and what you should do.
What does ‘bit’ actually mean?
A computer treats everything as numbers, and stores these numbers as sequences of zeros and ones. A single zero or one is a bit.
The terms ‘32-bit’ and ‘64-bit’ refer to the size of the numbers the machine’s brain – the processor – can process in a single step and, most importantly, how much memory it can handle.
An everyday analogy: the warehouse and shelf numbers
Imagine a warehouse where every shelf has its own serial number. The warehouse worker can only reach those shelves whose numbers they can write down on their slip.
There is little space on the 32-bit warehouse worker’s slip. It can number a maximum of around 4 billion shelves, which in computer terms means 4 gigabytes (GB) of memory. It is pointless to build a new wing to the warehouse if the shelf number does not fit on the slip; the warehouse worker will not be able to find it.
A 64-bit warehouse worker’s slip is practically infinite. In theory, it could number a billion times as many shelves; in reality, these machines currently handle terabytes of memory. This is more than enough for today’s needs.
In practice, a 32-bit version of Windows can generally only use around 3–3.5 GB of the memory installed in the machine. If you install 8 GB of memory in such a machine, the rest remains unused.
Why is this important in everyday life?
1. Speed and convenience
Today, on an average office computer, a web browser with ten tabs, an email client, an invoicing programme, an Excel spreadsheet and perhaps a video call are all running simultaneously. This requires far more memory than 4 GB. A 32-bit computer will slow down, stutter and programmes will freeze. This isn’t the user’s fault; the computer has simply reached its limit.
2. Software has moved on from 32-bit
Windows 11 is now only available in a 64-bit version. A 32-bit Windows 10 machine cannot be upgraded to Windows 11.
Free support for Windows 10 ended in October 2025, whilst Extended Security Updates (ESU) for home users expired in October 2026.
The paid enterprise programme will continue for a while, but this is merely a reprieve, not a solution.
The transition has long since taken place on smartphones: Apple made 64-bit apps mandatory in 2017, whilst the Google Play Store has required them since 2019.
More and more programmes, antivirus software and printer drivers are being released in 64-bit versions only.
3. Old programmes generally still work
Good news: 64-bit Windows runs most old, 32-bit programmes without any problems, so you generally won’t have to give up the software you’re used to. There are two exceptions to bear in mind:
Very old, so-called 16-bit programmes dating back to the DOS era will not run on 64-bit Windows;
Old devices (printers, barcode scanners, cash register connectors, scanners) require 64-bit drivers. If the manufacturer has not released one, the device will not work on the new machine.
Before making the switch, it is therefore worth compiling a list of the programmes and devices used within the company and checking whether they work on a 64-bit system.
And what does this have to do with cybersecurity?
It has a great deal to do with it, and this is the most important part of the article.
1. The greatest threat: a lack of updates
The mere fact that a computer is 32-bit does not mean it will be hacked tomorrow. The problem is that 32-bit computers almost always run old operating systems for which security patches are no longer available.
Hackers are constantly on the lookout for vulnerabilities in software. When a manufacturer fixes such a flaw, criminals can also work out from the patch description where the vulnerability was. On machines that do not receive updates, this vulnerability remains open forever. It’s like a shop where everyone knows the lock can be picked with a hairpin, yet the owner still refuses to replace it.
2. A 64-bit system can provide stronger protection
Modern 64-bit Windows has built-in security features that do not work on 32-bit systems, or only work to a lesser extent. To name but a few:
Address Space Layout Randomisation (ASLR): at every start-up, Windows places important programme components in different locations in memory, so an attacker cannot predict where to find them. On a 64-bit system, this is incomparably more effective, as there are far more locations to choose from. It’s the same difference as between a four-digit and a twenty-digit PIN code: the former can be guessed, the latter practically cannot.
Protection of the system kernel: 64-bit Windows does not allow any programme to tamper with the deepest parts of the system. On older 32-bit systems, some malware used precisely this method to hide from antivirus software.
Mandatorily signed drivers: On 64-bit Windows, only verified, digitally signed drivers can be loaded, making it harder for malware to disguise itself as ‘innocent’ device software.
Modern security features: Windows 11’s latest security solutions (such as features that protect passwords and login credentials in isolation, secure boot and the use of the TPM security chip) are only available in a 64-bit environment.
3. Antivirus programmes have also moved on
More and more security software is phasing out support for 32-bit systems. It may therefore happen that you can no longer install protection on an old machine, or that your existing antivirus programme suddenly stops receiving updates.
4. ‘Invisible’ devices: routers, cameras, smart devices
It’s not just about computers. Inside an office router, a security camera, a network printer or a smart alarm, there’s a small computer at work, and these are often 32-bit systems. The 32-bit architecture isn’t a problem in itself, but these devices are rarely updated; often, nobody pays any attention to them for years on end.
What’s more, some of the old 32-bit software will ‘overflow’ on 19 January 2038, much in the same way that people feared computers during the Y2K bug. That’s still a long way off, but it clearly illustrates that old technology will sooner or later reach its limits.
Lesson learnt: these devices should also have a designated person in charge who regularly checks whether there are any updates available for them.
5. Why should a small business bother with this?
It is a common misconception that hackers are only interested in large companies. In reality, small businesses are frequent targets because they spend less on security, making them easier to attack. A ransomware attack that encrypts invoicing data, customer lists or accounts can bring operations to a standstill for days. If customer data is leaked, this can also result in legal and financial consequences under the GDPR. An outdated computer that no longer receives updates is one of the easiest entry points for such an attack.
What should you do now? A simple to-do list
1. Check your computer’s specifications. On Windows, open the Control Panel → System → About menu. In the ‘System type’ line, you will see:
‘64-bit operating system, x64-based processor’: that’s fine;
“32-bit operating system, x64-based processor”: the computer could run a 64-bit system; you’d just need to reinstall the operating system;
“32-bit operating system, x86-based processor”: the computer is out of date; it’s worth replacing it.
2. Check whether the system is still receiving updates. If the machine is running Windows 10 or an older version of Windows, plan to upgrade to Windows 11, even if this means buying a new machine.
3. Make a list of essential programmes and devices. Invoicing and accounting software, printers, cash register integration: ask your supplier or system administrator whether these work under 64-bit Windows 11.
4. Don’t forget your network devices. Your router, cameras and network printer will also need updating. If a device hasn’t been updated for years, it’s worth replacing it.
5. Make a backup. This is the cheapest form of insurance: ensure you regularly back up important data to a separate device or a reliable cloud service. If something goes wrong, you can restore your data from this.
6. Ask for help. You don’t have to sort all this out on your own. A reliable IT specialist can assess your company’s computers in an hour or two and tell you what needs replacing. This costs far less than recovery following a ransomware attack.
In summary
At first glance, the difference between 32-bit and 64-bit systems seems like a minor technical detail. In reality, however, it comes down to whether your company’s computers are equipped to meet today’s challenges, or whether they operate within the limitations of a bygone era, leaving the door wide open to intruders. If your business is still using 32-bit machines, there’s no need to panic, but it’s worth planning the switch before the end of this year.
If you have any questions regarding your company’s IT security, please feel free to consult a specialist: prevention is always cheaper than repairing the damage.
The dates for Windows 10 and ESU reflect the current status as of October 2026
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