http://support.microsoft.com/default.aspx?scid=kb;en-us;Q812486
If the path to the FogBugz Maintenance service contains spaces the Service may fail sometimes. The fix is to edit the ImagePath registry key and add quotes around the executable path.
You can find the path in the registry here:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\FogBugz Maintenance Service\ImagePath
