Before you reformat try "The Cleaner" at www.moosoft.com it's about the best trojan detector I found. Some trojan's can not be picked up by doing a virus scan. Also try InnoculatePE at www.cai.com. I had Norton's also and InnoculatePE did the job where Norton's failed. I just go with InnoculatePE now and it's free. The Norton's cd is now a coaster. Beside's most virus load from the partition so a reformat might and might not help for that you need to redo the partition using fdisk. Good luck hope you can recover.