Unable to erase Virus

I keep getting messages saying trojan horse stopped but am unable to erase the problem.

Have run full scan at least 5 times, both deleting & moving to chest infected files.

Have also run the DOS program & still have the issue.

Any advice?

virus and False Positive problems should be posted in the viruses and worms forum section

and in that section you find this guideā€¦

follow instructions and attach logs (not copy and paste) http://forum.avast.com/index.php?topic=53253.0

run in order listed
AdwCleaner / Malwarebytes / OTL / aswMBR

when done, removal experts will be notified and help you
when finish, all tools used will be removed

you may also attach a screenshot of the avast warning popup