Hi so lately my computer has been getting worse and worse. When it starts it doesn't come up with the task bar or icons. this wasn't too bad as I could still access things through the task manager but now it says that the task manager has been disabled by the administrator. I have followed other forums instructions on repairing this issue eg; reg file, enabling through regedit, and gpedit... nothing works! please help!!
The fact that the taskbar isn't loading normally means explorer.exe isn't starting. However, I agree, it does sound like a particularly nasty virus. Here is a direct link to the Windows XP version of Malwarebytes, a free and particularly reliable antivirus:
Booting off a rescue disk from an antivirus company may help, although that won't fix any issues caused by a virus, just remove the virus. You'll probably have to run at least a Repair setup of Windows after things are cleaned out (assuming it's actually a virus causing this which sounds like it).
Avira Antivir has a rescue disk I've used several times that works well. Malwarebytes is a good one also, you'll want to run it from Safe Mode.