Boot to <SAFE MODE> by pressing the <F8> as soon as you depress the on button...
The when all the booting to the flimsy screen is over, run the system in Spy Sweeper, Nod32, Spyware Doctor, Avira, Avast, Windows Defender... On Virus, bu three spyware programs.
Once it runs the install in safe mode, and then the scan, reboot and run them in regular mode.
