My computer has been infected by a powerful vundo. I can see them in my startup programs but cannot uncheck them. It has changed my administrator password on the system so it does not allow me to make any changes. Even starting in Safe Mode, the trojans are still there and cannot uncheck them. The computer stoppted booting up and finally did it again yesterday. All applications are blocked and there is no way to start Hijackthis or any other program. It does not even allow doing a system restore. All executable applications are blocked. IE is also completely blocked. I can sometimes start Firefox in safe mode but cannot access most of the sites. One of the startup trojans is "sitomere.dll" which I cannot even find info on.
Any assistance is appreciated.