What is your anti-virus software?

I forwarded it to my bank's spam/phishing email address.

That's most likely a waste of time. If your bank does anything with it at all (which I doubt) they'd need the original headers. By forwarding the message, this information is lost. To preserve the original headers you'd need to save the original message and send it to your bank as an attachment.

I use AVG anti Virus. AVG popped up and said it was a threat, which I already knew. It disabled the threat, and after that I can't send any emails. Need to find the location of the temporary directory to fix issue, but I can't find the temp directory.can anyone tell me how to find it?

again, the error I keep getting when trying to send any email is:

Sending of message failed. Unable to open the temporary file C:\Users\Admin\AppData\Local\Temp\nsemail.eml. Check your 'Temporary Directory' setting.

how can I fix this?

Try to start *Windows* in safe mode with networking enabled.

- Win8 http://windows.microsoft.com/en-US/windows-8/windows-startup-settings-including-safe-mode

- Win7 http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode

- XP http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx

Still in Windows safe mode, start Thunderbird in safe mode.

- https://support.mozilla.org/en-US/kb/safe-mode

Does the problem go away?

I had already tried starting thunderbird in safe mode prior to posting the help message. it didn't resolve the issue. really need to find location of temp directory I think to solve this unless someone else has experienced this same issue and knows how to correct it.

I was talking about starting *Windows* in safe mode.

just finished a system restore to the point just prior to the issue. that fixed it.

I doubt that this did fix the underlying problem, and I wouldn't be surprised if you'll see the issue again. Anyway, good luck. It's always interesting to see how people read and follow instructions. For the time being you may mark this thread as 'Solved'. Thank you.

starting windows AND Thunderbird in safe mode did not make it go away. system restore made it go away. the problem is still finding location of temp directory, that is not solved in case it ever happens again. I can read and follow instructions just fine thank you, but a "fix" would have been finding the temp directory and going from there.

Perhaps if you asked Microsoft or AVG the cause of your problem.

open the start menu and type %tmp% into the run/search box and press enter. It is the hidden folder Windows uses, not Thunderbird.

You have allowed AVG to quarantine the file, result: All outgoing mail which reuses the name fails. No surprise there. So get AVG to actually fix the problem by removing it, not flagging the file for no access and you will make progress.