It is possible that the administrators group was removed from some of the
user rights assignments for your machine.
You can use MYTOKEN.EXE(Platform SDK) to see what user rights are assigned
to your administrator account. You can then compare this information w/ a
working admin account on another machine.
The output will look like the following. This is the section you would
compare to a working admin account.
Privileges associated with this token (18)
SeChangeNotifyPrivilege - (attributes) 3
SeSecurityPrivilege - (attributes) 0
SeBackupPrivilege - (attributes) 0
SeRestorePrivilege - (attributes) 0
SeSystemtimePrivilege - (attributes) 0
SeShutdownPrivilege - (attributes) 0
SeRemoteShutdownPrivilege - (attributes) 0
SeTakeOwnershipPrivilege - (attributes) 0
SeDebugPrivilege - (attributes) 0
SeSystemEnvironmentPrivilege - (attributes) 0
SeSystemProfilePrivilege - (attributes) 0
SeProfileSingleProcessPrivilege - (attributes) 0
SeIncreaseBasePriorityPrivilege - (attributes) 0
SeLoadDriverPrivilege - (attributes) 2
SeCreatePagefilePrivilege - (attributes) 0
SeIncreaseQuotaPrivilege - (attributes) 0
SeUndockPrivilege - (attributes) 2
SeManageVolumePrivilege - (attributes) 0
It maybe something like the admin account does not have the right to
load/unload device drivers.
The following article shows what each of the above user rights map to...
245207 How to: Determine NTRIGHTS Names and Meanings
http://support.microsoft.com/?id=245207
IBTerry [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.