In my last series of posts I had asked a question about a particular file that did not go away when I was instructed to delete all temp files. That file is still there and after researching the net, I found out this is a trojan. The file is "Perfdata_548.dat". This is a nasty since it loads on start-up, changes its number(_641;_560;ect) then deletes itself on shut down so you cannot delete it in safe mode. I have tried all the methods prescribed here, in this group, to get rid of it and it won't go away. I have also searched the registry and found it there in several places but I am always terrified of deleting any registry entries until I get the word it is ok to do so from the experts. Please advise.