Unable to delete infected file

I use Norton AntiVirus 2003 on my Pentium 4 1.6Ghz computer. It found 1 infected file, TTFLoader.exe by VBS.Sorry.C virus. Norton AntiVirus failed to deleted infected file from my hard disk. I could not delete it manually, because I could not find such file using Window Explorer with files being un-hidden. Search command failed to find infected file. I followed Symantec instruction in cleaning out the virus, yet it failed to delete infected file.

What I need to do to fix my problem?

By the way my computer is using Windows XP Professional, Service Pak 1.