So I was doing a tune up on a PC and I was told it had some viruses on it and it was very laggy. I installed free Sophos Virus Removal Tool just to see what was going on before I installed Webroot in case there was stuff that the free tool couldn't remove. I did the scan, and sure enough it had like 11 assorted trojans and malware. It took it all off but one. It was labeled "troj-Psyme-DT" so I installed Webroot, but it found NOTHING. I scanned with both of them like 3 times and both had the same result. So I found where exactly the trojan was located; in a folder on Symantec Antivirus that I just recently uninstalled. (Ironic huh?)
Can I just delete the folder C:Program FilesSymantec Antivirus since I no longer have the program to get rid of the trojan?
Also, the PC its on has Windows XP with service pack 3 if that helps.
Thanks!