Hard drive problems!

Hey guys,
Yesterday I turned on my machine and all of a sudden a CHKDSK thing went on for my new WD SE 160GB hard drive. It said it found an error reading a sector or something with the drive. I was like...okaymy to 90GB!! Also, when I am downloading stuff like off the internet, this little pop-up thing comes up in the task-bar saying there was an error reading the hard drive and that my data be wrriten to it know may be lost.

if you haven't already then i would get in touch with WD or goto their support page.

other than that i would try a virus check. oh and check your PM's ;)