Per Microsoft try this...
Article Q262076
To resolve this issue, change the data value for the Start Menu value to the default entry. The default entry is %USERPROFILE%\Start Menu. This value is a REG_EXPAND_SZ value. The Start Menu value is located in the following registry key:
HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Explorer/User Shell Folders
Article Q271735 also could be an issue...
SYMPTOMS
In a Windows 2000, when you log on to a domain that has been configured to redirect the Start Menu folder, you may experience the following symptoms:
When you click Start , nothing happens; the Start menu is not displayed.
The Start menu is displayed but it does not respond.
CAUSE
This problem can occur because either:
The Start Menu folder is redirected to a target folder that has been deleted or is unavailable.
-or-
You do not have appropriate access rights to open the target folder.
RESOLUTION
To work around this problem, use any of the following methods:
Verify that the Start Menu folder has been redirected to a computer which is available and online.
If the target computer is online but has been started on a different partition, the target Start Menu folder may still be available. However, it might not be a shared folder. To work around this issue, create a shared target folder with the same folder name, and then verify that domain users have read-access privileges to that share.
If the target folder no longer exists, create a new folder with the same folder name, and verify that domain users have read-access privileges to that share.
Log on using a domain administrator account that does not experience this problem, and then either disable the group policy or redirect the Start Menu folder to a target share that is accessible.
