Nostalrius Begins - Quality wow vanilla realm (1.12)

Sorry guys, I am not sure whats going on but i am getting that "the Information you have entered is not valid" problem. I hate to bother people with similar problems.

I was playing a few hours ago and had let my friends sign on to their accounts to try fix a bugged quest. now i am unable to login. I am 100% sure of my account name and password spellings. I tried checking my account name in the WTF folder, but there's nothing there.

username is uncharted45

any help is appreciated, would really not like to start over.

Depending on how you installed WoW, the WTF folder might be buried under your AppData folder. Browse to the following location and see if there's a WTF folder stored here:
C:\Users\%username%\AppData\Local\VirtualStore\Program Files (x86)\World of Warcraft Classic

If so, see if your account folder is in there. Otherwise, you can try running Wow.exe as an administrator; that should force it to create a WTF folder in the place you browsed earlier but didn't find it. Then try logging in and see if it works.

found the account folder, but it was listed as 71803x? only item in the account folder. No worries, i've thrown in the glove and restarted a new account. thanks though for the help! Much appreciated.

side note - browsing around it looks like my account never existed? even though i've been playing for a couple months now? just odd.

Had the same problem. After eliminating every other possibility, I moved the WoW folder out side of "program files" to a more public folder and that fixed the problem for me.