Here’s how to check which updates have been installed on your Windows 7 computer:

• Click Start, type installed updates, and then press Enter.

As shown above, Windows displays all the Microsoft updates that have been installed (including those for Microsoft Office). To check your service pack level, do this:

• Click Start, type winver, and then press Enter.

As shown above, Windows 7 with no service packs is version 6.1 build 7600. If you have a service pack installed, it’ll be shown on this page. As of the time of this writing, however, Service Pack 1 is still being tested by Microsoft.

You could also click Start, right-click Computer, and then click Properties. The Windows edition group at the top will show you any service packs installed.