need to TOTALLY uninstall thunderbird then reinstall it

I'm setting up a new computer (windows 8.1) and for some reason I don't remember how now. I had Thunderbird installed with a profile set up and then when I went to set up my wife user account I somehow messed up my version of TB. I have reinstalled TB a dozen times, I have did the %APPDATA% thing and had no success in reinstalling TB after that. For a while it would install but then go to a blank screen instead of setting up account. If I would try to write an email (this is the only thing that it will let me do) it would still have my email accounts setup. Getting pissed I did the %APPDATA% thing again and delete any files that came up, after I had already uninstalled TB for the umpteen time. Now when I try to open TB I get a message saying the profile is missing and can not open. What I want to do is remove TB so there is absolutely NO sign of TB ever being installed on this computer so I can start fresh. If I need to get into the Reg. I will, I just need detail directions... I have restored computer to pervious spot but no luck either... Thanks dn1000