Hello again sassofalco, it's a pretty simple task to uninstall WLOC. Just go to control panel>programs>uninstall. Select prgrams to uninstall and follow prompts.
Do all of this before installing your new antivirus.
There is no way to install an antivirus such as Avast without going on the net as that is where you will need to download it from.
I have had only 12 months experience at this, but somehow manage to keep learning.... as I am a set, forget and give me no hassles person, I have found Avast to have been terrific.
If go to
http://www.avast.com/eng/download.htmlou you will find Avast download. It's a very simple, few minute operation.
By the way I use Windows Firewall.
Good Luck,
GT.