Found this info whilst browsing around:
Two methods:
What you need is a copy of legitcontrolcheck.dll from any validated and activated copy of XP on a partition anywhere on your machine, then:
1.) create \windows\system32\ on any partition you want (even extended partitions)
2.) copy a validated ‘legitcontrolcheck.dll file into the directory.
3.) you might need ntdetect.com and ntldr in the root, (try without)
http://forums.********************/s...php?t=17685487
(goto my webpage for the proper link)
Another method:
1. Boot with the Windows Vista Upgrade DVD.
2. Click “Install Now.”
3. Do not enter a Product Key When prompted.
4. When prompted, select the Vista product edition that you do have.
6. Install Vista normally.
7. Once the install is complete, restart the DVD-based Setup from within Windows Vista. Perform an in-place upgrade. 8. Enter your Product Key when prompted.
http://www.windowsitpro.com/mobile/p...D=95011&News=1
So in theory you can save money by only buying the upgrade dvd, this also allows a clean install
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