To begin troubleshooting SYSVOL problems, check to see if you can access SYSVOL by using \\FQDN\SYSVOL.
If you cannot access SYSVOL, see article 257346, "Access This Computer from the Network User Right Causes Tools Not to Work" at http://support.microsoft.com/?id=257346.
If you can access SYSVOL, click the link below that best applies to your situation.