I downloaded wizards and warriors and i added a patch but now game wont run. I want to uninstall and reinsstall now.

Just look at the picture attached to my post.

Also you maybe have to manually delete the remaining files from the patch in C:\Program Files (x86)\GOG Galaxy\Games\Wizards and Warriors

If you don't have Galaxy, all GOG games have an uninstaller in the game data folder.

Yeah, I forgot many peoples do not use the client.

That comes up in french but I understand it the problem is Uninstall is grayed out on this game so the only option is to look at files.

Well, as Darvond suggested try to find an uninstaller (an .exe file) located in C:\Program Files (x86)\GOG Galaxy\Games\Wizards and Warriors

I am using the Galaxy window tab that GOG put on my computer. Tried uninstalling through windows but says its being used.

Restart your PC and try again.

I have uninstalled as best I can from windows and it removed it from program files but GOG still says its installed with the play button grayed out. there has to be a simple way to get GOG to reinstall the game.

And it literally doesn't exist for Linux. :p