Trojan.Downexec.G!inf is a detection method used to identify files that are infected with malicious codes. Infected files may download more threats to the computer and save the downloaded files as
%UserProfile%\Local Settings\Temporary Internet Files\tmp[RANDOM NUMBER].tmp
%UserProfile%\Local Settings\Temporary Internet Files\2krn.bin

How to remove Trojan.Downexec.G!inf infected files?
1. Perform standard procedure for Virus removal.
** Standard procedure for Virus removal

Remove these files if exist in your system.
%UserProfile%\Local Settings\Temporary Internet Files\tmp[RANDOM NUMBER].tmp
%UserProfile%\Local Settings\Temporary Internet Files\2krn.bin

Infected Operating systems : Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000