Can someone tell me what this file is? ( Perflib_Perfdata_1d4 ) I am running Windows XP home with Norton Internet Security. It is in my temp file and I can’t seem to get rid of it. Further more it seems to make more files. When I try to delete it I get an error message that says "can not delete because it is being used by another person or program".
Thanks

That appears to be a Trojan file.

I'd suggest following the steps outlined in this post:

http://www.techhelpforum.com/showthread.php?t=3702