I get "Unknown Error." when trying to re-log into the iTunes Store for Windows

My AppleID and password work when using a web browser and logging in here, but not when i try to log in through iTunes for Windows.
My events leading up to the error are below. Any suggestions for a fix/solution?
1) "Unauthorized Computer" message when trying to play newly bought iTunes movie.
2) Authentication Failed using AppleID
3) Sign out completely
3a) Try to sign in, but get "Unknown Error."
4) Uninstalled iTunes
5) Reinstalled iTunes
6) Login attempt: Unknown Error
7) Tried deleting "SC Folder" from User Tips
8) Login attempt: Unknown Error
Any thoughts on what I could do differently to get this resolved?

How I solved my UNKNOWN ERROR login issue:
I figured out that I had downloaded the 32 bit version of ITunes but I have the 64 bit version of Windows 8.    So I uninstalled the 32. and downloaded and installed the 64 bit version of ITunes and everything worked just fine.  The Windows 8 firewall was not an issue.
How to determine your version of Win 8.     Go to Control Panel, System & Security, then System and that screen shows the version.    
I just brought home a new Toshiba laptop and was surprised to see that I have the 64 bit version.  But pleased that I fixed the agrivating ITunes issue.
Good luck!

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