Article ID: 2008373 - View products that this article applies to.
When trying to upgrade from Vista to Windows 7, upgrade process fails with error message and rolls back to Vista.
During upgrade process the incorrect version of the iastor is referenced resulting in the above error.
To resolve this issue perform the following steps:
1. Access Driver Repository Folder under C:\Windows\System32\DriverStore\FileRepository and move any folders that contain the file: iastor.inf to a temporary location.
Note: To move the files from the FileRepostiry you may require additional permissions which can be accomplished by taking ownership of the the folder:
2. Search for references to iastor within the oem inf files in the c:\windows\inf folder.
Example Command: findstr /i /c:"iastor" %windir%/inf/oem*.inf
3. Make a note of the oem##.inf files reported where ## is a numeral. Move the oem##.inf and corresponding oem##.pnf from c:\windows\inf folder to a temporary folder.
4. Delete $~bt, $~LS and $~Upgrade folders from c:\ drive if they exist
5. Download and install the latest version of the iastor.sys driver from Intel website on the Vista machine: http://downloadcenter.intel.com/
6. Start the Windows 7 upgrade process. It should complete successfully now.
Note: Once the Upgrade process has completed successfully, there is no need to restore the iastore files, or the oem*.inf and oem*.pnf files back to their original location as the devices will no longer be needed.