Got an error message with suggestion that I move the data directory manually. So I copied the zotero directory into C:/Programs(x86)/Zotero and it wasn't found. But I figured it out and its now working. I would have deleted the discussion but I don't know how to do that.
Yeah, C:\Program Files (x86)\Zotero (if that's what you mean) isn't right, and isn't what it said. The default directory in 5.0 is C:\Users\:username:\Zotero. You should make sure that's the directory it's using, because C:\Program Files (x86)\Zotero is just the application directory and can easily be deleted.
1) What were you using before?
2) What's the current location of your Zotero data directory?
3) Were you using a custom data directory before?
4) Do you have a 'zotero' directory within either your Zotero profile directory or Firefox profile directory?
But I figured it out and its now working. I would have deleted the discussion but I don't know how to do that.