Check your Windows version in three clicks

The fastest way to find your Windows version is to right-click the Start button (the Windows logo in the bottom left corner), then click System. A window opens showing your Windows version near the top — it will say Windows 10, Windows 11, or Windows 7, along with a build number like 22621.

If that does not work, press the Windows key and the letter R at the same time, type winver into the box that appears, and press Enter. A window labeled "About Windows" opens with your version displayed clearly at the top.

You now know which Windows you have. This matters because older versions stop receiving security updates, newer versions may not run on your hardware, and some programs only work on specific versions.

Key Takeaways

  • Right-click the Start button and select System to see your Windows version in seconds.
  • Windows 10 and Windows 11 are the current versions; Windows 7 and earlier no longer receive security updates.
  • Your build number (the second number shown) tells you whether you have the latest patches for your version.
  • Knowing your version helps you understand which programs will run, whether your computer can upgrade, and how long you have until support ends.

Why your Windows version matters

Your Windows version determines what security updates you receive. Windows 7 stopped receiving updates in January 2020, which means computers still running it are vulnerable to viruses and malware that newer versions can block. Windows 10 receives updates until October 2025. Windows 11 receives updates until October 2031.

The version also affects which programs you can run. Some newer software requires Windows 10 or 11. Some older programs only work on Windows 7 or earlier. If you are trying to install something and it will not run, the version mismatch is often the reason.

Finally, your version tells you whether your computer can upgrade. Windows 11 requires specific hardware — a processor from 2017 or later, 4 GB of RAM, and a 64-bit system. If you have an older computer, you may be stuck on Windows 10 or earlier.

Understanding build numbers and update status

Next to your Windows version, you will see a build number like 19045 (Windows 10) or 22621 (Windows 11). This number tells you which updates you have installed. A higher build number means you have more recent security patches.

If your build number is several months old, your computer may be missing updates. To check for new updates, press the Windows key, type Update, and click "Check for updates." Windows will read and install any patches you are missing. This usually takes 10 to 30 minutes and may require a restart.

You do not need to memorize your build number, but if you ever contact tech support or post on a forum for help, having this number ready makes it easier for someone to understand your setup.

What to do if you have Windows 7 or earlier

If your computer shows Windows 7, Windows Vista, or Windows XP, it is no longer receiving security updates. This means new viruses and malware can infect your system without protection. If you use this computer for email, banking, or any sensitive information, upgrading is important.

You have two paths: upgrade to Windows 10 or 11 on your current computer, or buy a new computer. Upgrading works if your hardware is recent enough — Windows 10 runs on most computers from 2010 onward, though older machines may run slowly. Windows 11 requires newer hardware and may not be possible on very old systems.

If your computer is too old for Windows 11 and too slow for Windows 10, buying a new budget computer is often cheaper than dealing with a virus infection or identity theft. A basic Windows 10 or 11 laptop costs $300 to $500 and will run faster and safer than an old machine upgraded to a newer version.

Finding your Windows edition (Home, Pro, or Enterprise)

The System window also shows your Windows edition — usually Windows Home, Windows Pro, Windows Enterprise, or Windows Education. Most personal computers run Windows Home. Pro adds features like remote desktop and better security tools, and costs more.

You do not need to change your edition unless you need a specific feature. If you are unsure whether you have Home or Pro, the System window shows it clearly. If you ever need Pro features, you can upgrade through the Microsoft Store, though it costs money.

Checking Windows on a work or school computer

If your computer is owned by your employer or school, it may be locked down so you cannot see all the information in the System window. You will still see the version number, but some settings may be hidden or grayed out. This is normal and means your IT department controls updates and settings.

If you need to know your build number or edition for a work reason, ask your IT support team. They have records of every computer and can tell you exactly what you are running.

Frequently Asked Questions

Can I upgrade from Windows 10 to Windows 11 on my current computer?

Only if your hardware meets the requirements: a processor from 2017 or later, 4 GB of RAM, and a 64-bit system. Check the System window to see your processor and RAM. If you meet the requirements, Windows will offer the upgrade automatically through Windows Update. If it does not offer it, your hardware does not may have access to.

What does the build number mean, and do I need to update it?

The build number shows which security patches you have installed. A higher number means you are more up to date. You should check for updates monthly by going to Settings > Update & Security > Check for updates. Windows will read and install patches automatically if you let it.

Is Windows 10 still safe to use?

Windows 10 receives security updates until October 2025, so it is still safe for now. After that date, it will no longer receive patches and will become vulnerable. If you are using Windows 10 today, plan to upgrade to Windows 11 before October 2025.

Why does my computer show a different Windows version than my friend's, even though we bought them at the same time?

Different manufacturers install different versions. Some computers come with Windows Home, others with Pro. Also, if one computer has received more updates, its build number will be higher. The version number (10 or 11) should be the same if you bought them around the same time, but the build number may differ by a few months.

Can I downgrade from Windows 11 to Windows 10?

Yes, but only within 10 days of upgrading. After that, you would need to do a clean install, which erases everything on your computer. If you upgraded recently and want to go back, go to Settings > System > Recovery and look for a "Go back" option. If it is not there, you waited too long.