Firstly, Great Laptop, yours is a lot more powerful than mine is.
Secondly I don't think the hard disk is corrupted, however i do recommend you do a disk De-fragment on the drive. Things you should remove are programs you no longer use, If your hard disk is full, then transfer your stuff over to a external hard disk or some form of external storage.
I would say it has something to do with anti-virus software but the computer i experienced that on was a Toshiba Satellite L30 With Xp and Kaspersky Pure. (Which now runs Kubuntu)