The built in zipping capability works just fine on it's own. You download a zip file, right mouse click and select "extract all". It unzips into the same folder you downloaded it. No need for any other unzipping utility unless the file was zipped with stuffit. That is the only problem I've ever had. So....I use Stuffit (which is free I believe) to unzip stuff that my XP zip utility won't handle. I have XP Pro. Computer is about 2 years old.