Windows Experience Index could not be computed – disk assessment fails

windows 7windows-experience-index

When trying to rate my system's performance with the Windows Experience Index, I get an error:

The Windows Experience Index for your system could not be computed. Could not measure storage performance. Error: Failed to properly assess the disk. The data is invalid.

How do I work around this? I suspect it might be related to the use of Intel's Rapid Storage technology to RAID10 the drives.

Best Answer

This was solved by:

Open Computer->Properties->Advanced System Settings
Click the Advanced Tab
Click the "Environment Variables..." button at the bottom
The local user variables for TEMP and TMP use paths that include %USERPROFILE%. Replace this with a hard link, e.g. D:\User\[username]\AppData\Local\Temp.

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