Trojan.Initbar and Vista

I'm running Vista Home Premium on a HP tower. It's the 64 bit operating system with 4GB of memory and a 2.2 GHz processor speed.

 

I've seen this type of Trojan before, so I did not download any software to "fix" my problem. I downloaded the removal tool from Symantec. When I try to run the tool, I get a window saying "You do not have Administrator rights to run the tool. Please contact your Network Administrator for more information."

 

I am on a stand alone PC where there is no network hook up and I am signed on to my PC as "administrator" with no other users available.

 

Any ideas?

 

Thanks in advance.