Hmmm... How about searching for it in the registry? Load regedit, click Edit|Find, type in trickler-4010.exe and press [Enter]. If found, I'd delete it.

As far as deleting the actual trickler-4010.exe program, I'd reboot in Safe mode, get to a DOS prompt (click Start|Run, type command and press [Enter]) and then type:

deltree c:\windows\system\trickler-4010.exe

(and press [Enter]).

Type:

exit

(and press [Enter]) to close the DOS window, then reboot.