Hi

the trojan horse is the virus and im using AVG as my anti-virus but it seems that my AVG can't delete the virus it only detects it!!!!
Yes AVG is not very good when it comes to Trojans.......I would most of the Antivirus are not good when it comes to cleaning trojans........heres is what i would suggest ..do a online scan at .....Housecall ..it will find the trojan and most probably say File is uncleanable......so select the file and Press "Delete file"..

Or If you want to do it more sophisticated way Download Moosoft the Cleaner ......it's free to use for 30 days...it will be able to ret rid of the trojan....Download it update it ..and run a scan.....Also try scanning in safe mode...

If you can tell the exact name of that trojan that AVG detects we might be able to find some Removal tool for that Trojan...

And By the way Trojan Horse is not a Virus.....

--Good Luck--