I had something all too similar on a client. But after we got the machine we found they were a torrent user and scans with other tools found more. Here's why I ask for more clues. Think over what you are using the machine for. Anything 'iffy'?
I have windows vista ultimate and am currently using avg and advanced system protector and ccleaner for pc maintence. I did a scan with the advanced system protector and have found that I have something called dialer.delf.f and trojan.dropper.delf on the pc. Well, once the scan is done, it offers to clean it and so it does. the problem is that I would say when it does its routine scan maybe two or three days later, it will find that file again. I have cleared the quarantine and everything and yet they keep coming back. Any help would be appreciated!