hi,i just downloaded a free version of avast pro...and i scanned my laptop....seems i had a virus,trojan....and every error gives i make..repair...program cannot repair..and..i make delete all... and some of files have been from windows.....i'm not a programmer,but i tell you what i saw..the exe files from windows,some of them are missing....and now,appears nothing on my desktop......it's logged on but only when i press ''ctrl lt del'' i can see the process on the screen,and give a new task.i tried system restore but nothing changed....if anyone know how i can fix that,because reinstalling windows..(i lost the original cd)...and my laptop i've used with an external dvd rom,wich i have no more....thanks a lot