Virus may have bricked my computer

I've never had a virus on any of my Macs, so I need help dealing with this one.... Safari was closing sporadically after about 5 minutes of use. It would close with an error message referencing '.KlondikeMineD.tmp.' I knew immediately that this was no good, however, I didn't know how bad it would be. I ran Avast! (I know... I'm kicking myself for not running ClamAV). So Avast found KlondikeMineD.tmp to be a trojan and when I tried to 'chest' it I received an error message saying the program didn't have the ability to do it, or something like that. Now I knew I was I trouble. I attempted to boot in safe mode and was not able to log in to the administrator account. I am still able to log in as guest with full networking capability, but that does me no good since I can't run a scan or access anything on my administration account, which is where the virus is.

Any help on this would be fantastic. Is there a AV prog out there that has the ability to perform a scan at boot? I'm kind of freaking out because I have tons of pics on my HD that aren't backed up, including baby pics. Thanks for any ideas.