I think my computer's trojan infected

I’ve got something called “30DECCD8d01.Vir” in the quarantine folder on my computer. Either MacAfee or Ad-Aware put it there, I don't remember. Every time I try to delete it a message pops up saying "cannot delete 30DECCD8d01 access denied. Make sure the disk isn’t full or write protected & that the file is not currently in use”. Also, I get a VirusScan On-Access scan message pop-up stating it’s a detected as a JC/Downloader-AUD.

Can any of you guys help me with this thing?

Best thing to do since you can't do the delete and the auto removal is do a google search for that virus and include the words manual removal. What you will end up having to do is boot into safe mode and go into the registry and remove the entries that it's created and files it's created else where.

Restart in Safe mode and try to delete it. Also turn System Restore Off and then turn it back on (deletes restore points) - malware can hide in restore points.

Spybot search and destroy and AVG antivirus. They work amazing together. Thats should take care of it. If you have any other problems google the file name and see what comes up.

Unless you're a computer expert, I would say you can't trust your computer any more and should consider a re-installation of the Operating System after backing up your data and settings.