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 ...

Had the same problem myself. Here is the fix: Click  Start Type cmd in search field right click on the cmd icon showing at top of search box and click on run as administrator type  cd\    press enter type   net stop winmgmt  (include spaces)  and press enter type  y type   cd ...