Booted in safe mode, deleted!
Great! I'm glad it worked.
I am surprised that Zone Alarm is not held in high regard? I will check out Windows Defender though...
Everyone has their likes and dislikes of security software. There are a number of things that affect the effectiveness of the programs besides the quality of the program. These include but are not limited to: other software on the computer, the operating system, how much memory and RAM is available, and browsing habits.
I tried the Windows Defender a few months ago. I booted it off the system in less than a week because of the problems it caused.
I used the ZoneAlarm Security suite for a while. My experience with it: it certainly is a decent suite and offers reasonable protection, it is heavy on system resources which given my 256 RAM is an important concern, it is very difficult to use in safe mode, and getting support - if the information is general it's pretty good, but if one is looking for answers to very specific questions I find it is not so good and is instead rather frustrating. I personally find that I like separate applications for the different security aspects of the suite. You can see what I currently use in my signature below.
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An ounce of prevention is worth a pound of cure
SpywareBlaster, WinPatrol Plus, ESET Internet Security, NoScript Firefox ext.