Well first things frist go learn to make the fake virus at
http://www.gaminggutter.com/making-f...us-t25829.html
Next Get on the person your wanting to screw withs account. Or, go to C:\Documents and Settings\All Users\Start Menu\Programs\Startup to do it to all accounts.
Drag your fake virus to the Start up folder in Start->All Programs->Start Up Or paste in C:\Documents and Settings\All Users\Start Menu\Programs\Startup\
Now when you log in your fake virus will be activated. Remember you can leave out the -t and time and your computer will shutdown automaticly. Making it impossible to get on the computer.
TO FIX: Boot in safe mode and remove it from the folder where you put it.
Will add screen shots later.