Windows Vista enter two words or shut down

no matter what i'm doing on the comp every few minutes a blue screen appears which tells me "enter both words below separated by a space" and it gives me 3 minutes to do this or the comp will shut down, this screen stops me doing anything until iv put in the two random words, does anyone know how to get rid of this please?

i have also started getting lots of pop ups to since this has started even when im not on the net.

thanks

 

Very strange, my first visit would be Malware and Virus removal...

Please read this and post requested logs in the Malware and virus removal board.

NOTES:

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