Well if you dont know too much info your better waiting for someone to look at it, because unless u can give specifics of partitions and stuff. It could be chasing shadows u know what hdd u got?. If so might be worth a look on their web page manufacturer should have some software to test that the hdd is ok.
When one of my hdd was on the way out it would do that, also had a problem once when everything slowed up when I had a period of installing and removing lots of software and not always getting rid of registry edits.