Find out what Operating System you own:
1. Click Start, and then click Run.
2. In the box, type winver, and then click OK.
The window that appears will show you which version of Windows your computer is using.
If you are using Windows XP with Service Pack 2 (SP2), you will see the service pack listed as shown by the highlighted area in the following image:
The Windows Operating System's for home PC's are Windows:
  
2007 - Vista - Home Basic, Premium, Business, Ultimate
Note: These instructions do not apply to Apple Macintosh computers. To find security information for Apple computers, visit the Apple security site.
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