A more general solution to problems like this is to use windows file security to lock down the offending file.
I have also used this in one job when some fool in IT insisted that we have some garbage "management" software on our systems. You'd kill the processes, remove the directory, and next login it was back, worse than a virus.
Right click on the file / folder in question, select properties, and hit up the security tab. This tab isn't present by default on XP Home, yet another classic MS bugger up. Go to
http://www.tweakxp.com/displayf.aspx?id=11654 and follow instructions to get this tab to show.
Uncheck the "allow inheritable permissions" checkbox, and then for all users / groups shown, deny everything. For good measure, I add an entry for "Everyone" and deny all on that. Hit OK, the system will bitch at you that you've prevented everyone from accessing the file (duh!), tell it that it's OK, and you're hot to go.