I'm back from vacation now, ready to try to quell my computer's demons.
I'm sorry for questions that are probably riciculously simple, but to a n00b it all seems terribly ominous.
I did the fixboot, but computer still won't start in normal mode. Was I supposed to boot differently somehow, so as to boot from the new bootsector?
EDIT: After selecting boot from normal mode, and letting my computer sit for long enough, it got to the logon screen. When I typed in my password and pressed enter, it blue-screened again, but this time I've got what it says:
*** STOP: 0x00000022 (0x000F00CF,0xEC66E7CC,0xEC66E4C8,0xF82F3154)
*** MDFSYSNT.sys - Address F82F3154 base at F82BB000, DateStamp 48863529
Does this help? If not, I've got a pretty good picture of the BSOD, so I can tell you more if you need to know it.