pnk

hey
yesterday i was playing on my computer and my pc froze.
when i turned it on again it was asking if i want to repair the start-up files or just start, i selected just start and it took very long time loading the windows vista (the loading bar before the login) and when the bar was gone the computer screen turns blue for one second and it reboots.
after that i selected to repair the files, and after some time i got the mouse icon on the blue screen with nothing else.
what's my play here?
i'm really bad with computers so i guess it's better to take it to a store?