Ok...I had been using Windows XP for a while, then someone told me that I need Service Pack 2 to be safe. So I downloaded it, and started installing, but then it said "Access is denied" and started uninstalling itself. Then it requested a restart, so I clicked "Restart Now."

It started to boot up normally, but after the Windows loading screen, it turned all black. Then the computer made a beeping noise, and a blue screen with words on it flashed for a fraction of a second before re-booting again. The blue screen was annoying because it flashed too fast for me to read anything on it. So if I were to not touch anything, the computer would boot in a loop and never stop.

So I tried using the Windows repair CD for Dell (even though my computer isn't a dell), but when it booted it said:
"Bootsector Write ! !:
Virus continue? (y/n)"

I decided to get a brand new harddrive, and tried to just boot from the normal Windows CD, but it wouldn't boot from the CD. Everytime, I don't remember exactly what it said, but it would basically say that it could either not read the CD rom, or could not detect there was a CD in it. But it could read the other CD i put in it earlier, so I couldn't tell what the problem was.

Then I tried booting from a windows 2000 CD. It told me there was a virus in the bootsector, which I don't know why, because it's a brand new harddrive. But it gave me the option to override it, which I did, and installed it and it operated no problem. Currently I am upgrading from windows 2000 to XP, however I'm afraid that the same problem I originally had with my old harddrive will show up again, and I won't be able to boot.

Judging from what has happened, do I have a bootsector virus or no? I'm not exactly sure what to do.