Well, I did the standard update on malwarebytes yesterday, and they have a free 14 day trial of the bought version...so being pretty tight I accepted it on my laptop and the pc. What a mistake that was.
This morning laptop would start up but not run any programmes or shut down...had to remove the battery....thought it was a conflict with AVG....until I found the pc was the same (no AVG) Laptop is on windows7, pc on vista. I managed to un-install malwarebytes from both and harmony is restored, so re-downloaded it to pc, but rejected the trial offer and even thats ok now. So be warned, dont accept free trials