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While upgrading to Windows Vista, you may get the following error message.

“Windows cannot install required files. Make sure all files required for installation are available, and restart the installation” Error code 0X80070020
or
“Windows could not update the computer’s boot configuration”

Steps to Resolve :

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.

Note: Take necessary backup of the registry before editing.

Bala
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