Keylogger wont go away

My virus scanner popuped and said “trojan deleted : keylogger-briss”. It happened about 5 times, then i scanned my computer for viruses and deleted about 4 more. I ran it again after i scanned the first time and got another keylogger-briss. What should i do?!

i cant reformat my computer because i dont have my flash/photoshop/internet disks.

i read the description of the keylogger, it takes all the passwords i type in and send them back to a remote computer. So ive only gone in my email and the forum. none of my domains or anything.