Primary Hard diver 0 failed

Hi all:

My laptop can?t boot normally. Must boot many times(it seems like when it is hot, it can boot it normally)

Here is the info:

Dell Inspiron 4150
Bios version A04
OS. XP professional

What I have done:
Because it can?t boot, I though it cause by virus. I did saw some virus when I used Norton to scan my PC. Don?t know when one day it can?t boot. Message: Primary Hard diver 0 failed. F1 to reboot, F2 to setup?. I used the utility software CD come with the notebook. It found nothing. All test past on the hard drive. In the Bios I saw the hard drive and there has not option like the desktop to reset to default Bios. I still doubt the virus may infect my pc & changed the Bios setting. Does anyone has any problem like this on Dell Notebook? And any suggestions. Thanks in advance