Hardware problems causing hard drive issues

[extremefire]

Working on my sister's computer, and I had to replace a hard drive that was taken over by bad sectors at the end of last year. Well today she brings by her computer and a new Seagate drive that I put in now has 7 bad sectors. I am starting to think that there is a problem with something else in the system.

Where should I start?

Here are the specs

AMD Athlon 64 2800+
Epox socket 754
Ultra 512mb
nVidia 5700LE 128mb
Seagate HDD
Sony DVD+RW
Sony DVD
Raidmax 420W (13A@+12v)

 

[Standpoint]

I don't think that bad sectors are going to be caused by any other hardware. Possibly a virus though? If you format the HDD w/ a fresh install, then run a disc checker, do you still have bad sectors? I'd try that myself.