I have a HP Compaq 6000 SF running Win 7. After setting up Win xp on dual boot beside Win 7 and the usual loss of bootsector issue -- well, one thing led to another, and in the end I was unable to boot into either one and after booting up I get only "invalid boot.ini file." I decided that what got me into this jam was that my onboard CD drive was throwing curve balls. (By the way, I previously found out that the computer was incapable of booting from a USB.) So I bought an exterior USB CD drive as a possible fix. When I went on the computer to try it out I found that I could not get into BIOS to change boot priority. I repeatedly tried to either specify boot priority (F9) or do it in setup (F12) during the brief instant when the logo appears but kept going straight to "invalid boot.ini". I then used the "pause" button to give me a chance to use F9 or F12 and the system did pause. However, F9 or F12 was still taking me right to "invalid boot.ini file." I'm at my wit's end.