Hi I had a trojan, could not get the name of it, reformatted my whole hard drive, reinstalled windows vista, I have managed to lose half of my partition I think I had 128 gb but only have 68 gb, but then again it could have been 69 gb , I can't remember.  When I am away from my computer I notice the calculator has popped up and windows live ...

I have to concur, in the last 5 years I have only had 2 virus alerts on my PC, and both times dealt with, I put this down to good security, including not opening 'dodgy' emails and not visiting 'dodgy' web sites