Download Malwarebytes Anti-Malware on ANOTHER computer.
Suggest use the free version. It's all you need,http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
(Click on Download Now in the small green rectangle, to the top left side )
Once downloaded to the alternate computer, burn it to a CD disk.
Turn your laptop on, and open the DVD drive tray. Install the Malwarebytes CD disk, close the tray.
When Malwarebytes is loaded, install it. Then run Malwarebytes.
You may see pop-up, after pop-up, as Malwarebytes is running. So many in fact, that you may not see the Malwarebytes screen, and wonder if it is running.
IT IS. Takes usually around 8 minutes to complete.
The pop-ups may have what looks to be genuine Microsoft icons. (Shield)
Some are real, some are not.
Click on the real ones? Why? Microsoft hasn't done you any good in this matter so far.
It doesn't work, and you are just slowing down Malwarebytes. Do Not touch anything until Malwarebytes is done.
Once done you will have your Administrator privileges back again.
You can access Control Panel, Task Manager, System Restore, etc.
Suggest you go to System Restore, and TURN IT OFF, temporarily.
System Restore restores the laptops files, AND the 'virus'.
Click on Start > Hover your mouse cursor on All Programs > Go up to Accessories, over and down to System Tools, and over and down to System Restore. (Windows XP)
Click on System Restore.
When System Restore has loaded, click on - System Restore Settings - on the left side of the screen.
Click IN the empty box to the left of - Turn off System Restore on all drives
Now go below to the right, and click on Apply.
Go below to the left, and click on OK.
Run Malwarebytes one more time. When finished go back to System Restore > System Restore Settings > and click in the box once more. Empty square box.
Click on Apply, and OK once more.
Also suggest you go back to the main System Restore page, and click on the circle to the left of -
Create a restore point. Then click on Next at the bottom.
You will have a system restore point that you Know is good.
(Be aware that after time the restore point is gone. Windows updates the restore point. You may want to go into system restore once in a while, and ensure you have a vaild good restore point)
The 'Virus' you picked up is no virus at all. It's a sham.
It is a 'Scareware Malware'.
Pretends to be genuine, but is a hoax. Purchasing it does nothing. It does not remove itself.
It is a new version of an old piece of cr@p, MS Antivirus,http://en.wikipedia.org/wiki/MS_Antivirus
For additional questions please post in a Comment.