Windows 7: Windows 7 won't start

Hey guys!
Ok so here's an update. I sent the computer for repairing and data retrieving. They managed to retrieve my data on an external hard disk using a mac which is good.. (and costly). But when they tried restoring it to factory settings.. that failed.. so i still can't start windows.
And here's another funny thing.. now while i'm typing, the letters are messing up sometimes. wtf is going on. i'm scared. like if i press space, somethng else miight show up (see in this sentence, it skipped an "i" and added an "i").. it seemto be skip ing letterp or spacessand adding them later on!! <--- ! help help help