Need help identifying my problem :(

Hey Guys,

So there i was last night when my laptop shut itself down, i turned it back on to bw greeted with a message saying something along the lines of disk drive error- replace the disk drive and press any key, anyways i though it was game over and went to bed.

This morning i was amazed to find the laptop was working great, i ran a scan and disk check errors, it was alll good.

Anyways, i went to the gym and when i got home i turned it on to find that it worked great up to the desktop screen, here no programs were opening and only half my icons were apperaing at the bottom and when i click on them they immediatly do not respond, i cannot get onto the my computer folders. However i can run the laptop in safe mode and everything is fine. Also after restarting my laptop a few times, a screen came up saying that it is scanning my hard disk in 3 stages. :S

-I am using Windows Vista Home Premium
-It us an Advent 5312 Laptop

Thanks in advance!!!