I was doing a system restore on my acer aspire 2930 laptop and it was loading and working fine but then my scr?

i was doing a system restore on my acer aspire 2930 laptop and it was loading and working fine but then my screen went black so then 5 minutes later i switched the laptop off. put it back on and it says install windows click ok. i clicked ok and it restarts and comes back on and says the same thing again. it syas something like the system restore was corrupted please restart. but then it says the same thing again when restarted. i really need help ???? i know its not a virus.