most people aren't realizing that this just happens when you have a 64bit processor with a lot of programs on xp sp2, especially if you have an nvida chipset and you install the sw ide driver (you don't need it if you aren't running a raid setup)
The Ultimate Hard Drive Utility PowerMax 4.23. (It now has the ability to clean a Boot Sector virus on the quick erase option.)
The best browser Netscape 8
Have you accidently delete something? Look here (trial. the better one) and here(free)
Id say no matter what just use hijackthis on your system and remove software from your startup. Stuff like quicktime, realupdate, java, etc. Its also not a bad idea to do it just because you know what starts up everytime.