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Source: Microsoft Support
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On a Windows Vista based computer that runs Symantec AntiVirus 10.2 client, you enable EFS for documents on the Desktop or in the Documents folder. After you reboot the computer and log on again, the encrypted files cannot be decrypted.
The problem does not occur when folders are encrypted in other locations.
Also, when Symantec AntiVirus is uninstalled the problem goes away.
This occurs due to a problem of Symantec AntiVirus 10.2 client for Vista.
To resolve this issue, contact Symantec to upgrade the application. By September 2007, Symantec has released Maintenance Patch 1 for Symantec AntiVirus 10.2 client for Vista, which resolves the issue.
For more information about this issue, please read the following Symantec document:
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