How do you remove Trojan horse downloader j dloader-j from the system volume information folder on XP?

If the virus is in the system volume information Download AVG from Grisoft.com, it is free. AVG will not pick it up straight away though. Follow the steps in this page and run AVG complete test. AVG should have picked up your virus this time. (You have the option in AVG to run a custom scan where you can set it to scan the system volume information only).