If you’re interested in upgrading your existing PC to Windows 7, you can use the free download from Microsoft, the "Windows 7 Upgrade Advisor," to scan your PC and help you understand whether everything will work, whether a clean install will be required, or if an in-place upgrade will work for you, saving time and the headache of backing up and reinstalling all your programs and data.
The "official" download is available at http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=1b544e90-7659-4bd9-9e51-2497c146af15
I invite you to take a look at what ZD net has to say as well, and if our download above isn’t working it’s mirrored below:
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Windows 7 Upgrade Advisor 2.0.3001.0 (Windows), from Microsoft – Free Downloads on ZDNet | Shareware
Windows 7 Upgrade Advisor