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Go to the Start > Settings > Control Panel > Services and stop all of the backburner services that may be running on the system.
Once the backburner service has been stopped, reinstall the 3ds max 5.1 update. Note that it is not necessary to reinstall 3ds max.
If you receive an error indicating that the max.task file is in use and cannot be updated, then you may have missed one of the backburner services. Recheck the services panel or have your IT person check to see if there is still one running.
If this fails to resolve the issue, or you are certain you are not running the backburner service, then the problem is likely just due to a corruption of the 3ds max files. You will need to completely uninstall and reinstall 3ds max, being sure to delete the 3ds max folder before doing reinstalling. We also recommend you contact your local reseller and obtain a 3ds max 5.1 update or demo CD.

NOTE: The 3ds max 5.1 demo CD will work as a fully functional version. Simply replace the "000-00000000" serial number with your 3ds max 5.0 serial. Reauthorization of 3ds max should not be necessary provided that you did not delete the C:\C_Dilla folder or its contents.