I evaluated McAfee Site Advisor recently. Uninstalled it. Removed manually all the bits I could find and I thought CCleaner would find any registry entries I had not manually removed.
I find " McAfee Antivirus" in the list of applications under CCleaner. ( McAfee Antivirus was used about 2.5 years ago . Since then the disk
I've found that traces of what CCleaner finds and supposedly removes...if there's anything "leftover" they're harmless bits of registry hive nonsense that are usually 1 bit or 0 in size. Even on a small XP drive they're minimal at best. Certainly not something that should be "first priority" in regaining disk space.
You wanna breathe of fresh air? Get a Windows 7 tower with a terabyte drive. Big difference.
McAfee probably has left over registry keys, and application data. If you installed it for a 3rd party browser such as Firefox it will also still be lingering inside your profile prefs file.