To resolve this issue, restore the default value for the UpperFilters registry entry, and then restart the computer. To do this, follow these steps:
1. Click Start, click Run, type regedit , and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E967-E325-11CE-BFC1-08002BE10318}
3. In the results pane, right-click UpperFilters, and then click Modify.
4. In the Value data box, type PartMgr , and then click OK.
5. Exit Registry Editor, and then restart the computer.
6. Insert the Windows Vista DVD, and then upgrade the computer to Windows Vista.