Well seeing as how we can't have a thread talking about browsers without Avant propaganda taking over i guess i will try to help. If you deleted a file u needed u may want to try restoring your computer to a time right before you deleted the file. Click Start > All Programs > Accessories > System Tools > System Restore
. Then select restore my computer to an earlier time and click next. Pick the closest restore point before the deletion from the calender. Click next then next.
O ya FireFox FTW