is it a dell? if it is, their laptops have been known to do this, mine did the same but i just had to deal with it for a while then it eventually went away, seems like everytime i reformat the laptop its starts this again but im not sure what it is that makes it go away but eventually it does...
-Desktop- Dual Monitor, Q8200 2.34Ghz, 8GB, 1TB, XFX 6850, 7 Ultimate
-ASUS UL50- SU7300, 4GB, 500GB, G210M, 7 Home Premium 64, XP Pro
-HP NC6400- Core Duo 1.86Ghz, 2.5GB, 64GB SSD, x1300, XP Pro