Yesterday evening I began running diagnostics on my computer because it was running slowly. I ran an option provided under my program menu which is titled PC tools. After 4 hours of testing (blue screen) which tested 5 items, my screen was then prompted to bios. It would not allow me to enter F1 for set up or F2 to continue. I made several attempts to re-start in safe mode, but my computer was frozen in bios. And stated hard disk imminent failure. Need to replace. Therefore, I turned my computer off for about 1/2 hour. Currently I am up and running, but am worried this will occur again at another horrible time. I run Windows XP Home Edition, I have a Compaq Presario AMD Processor 3500, with 1.79 GHz, 448mb of Ram. I have since backed up my data onto my flash-drive, but with impending finals in 3 weeks I am very concerned......Any help would be greatly appreciated. Should I replace the hard drive, and if so any particular brand? Computer currently has samsung sp1604nr listed as its master drive. Or should I purchase a new pc tower? Also, the computer is only 13 months old, and is primarily used for work/school. Please note, I am not a computer literate, but do know more than just the basic....Please us laymen's terms. Thank you in advance for your time and consideration.