FixMBR writes and replaces the infected MBR with a clean mbr(standard mbr code).
What is your OS?32 or 64 bits?
As far as i know alureon doesn’t infect the mbr,actually some variants may do but i don’t know so i wouldn’t run FIXMBR.
Edit:A variant called Alureon-DOS infects the MBR.However running FIXMBR option on 64 bits system can cause crash.

Please follow the instructions here and post the log>http://support.kaspersky.com/faq/?qid=208283363
Or follow com’s155 post.