Windows 2000 schedule task failure

Hello all,
I am a cs student that has recently been thrown into the lions den at work. I have been asked to resolve some windows 2000 server issues and I'm at a loss as to what to do next. My schedule tasks function keeps giving me the following error:
0x8007052e: Logon Failure : unknown user name and password.
I have tried all of the obvious troubleshooting techniques to no avail. I even referenced a "How to schedule Tasks" tutorial...lol... just to be on the safe side. I know that there was a hot fix issued for this exact problem and, accordind to my file search, I contain the mstask.dll.  I have been scheduling tasks using the AT comand and they run.... and run....and run...and never seem to finish the task. When I manually run my batch file, it works perfectly, eliminating that as the possible issue. I am logged on as the administrator with full permissions......so, what am I missing??? 
I, and my blood pressure, greatly appreciate any and all help.

Are you a domain admin? or is this machine a stand alone server and you are a admin on it?

Also the job you are setting up...what does it do?

I hope this helps....it is a stand alone server on a network with about 10 other computers. I only have admin permissions for the stand alone server. The person who did this job previously was abruptly dismissed, so asking him questions is not an option. The only password I found in his things was for the server. 

The batch file is a database backup to an omega drive

Although I have my hot fixes, is there a way that they could have been installed incorrectly, causing these issues? (I know, I'm grasping at straws  )

[Moderator]

If possible post the batch file and we'll have a looksee.