Thunderbird prompted for upgrade; then apparently acted like it needed a donation before proceeding; acted like it got a virus, hundreds of login fails; locked up...need password help to log in to Thunderbird and I don't know about IMAP, email keeping my password, etc. I found something on the computer like that but it didn't have a PW saved. I deleted Thunderbird and downloaded a fresh one but after running the exe for Installing it, "install" failed I don't know what to do now.