I tried in safe mode with same results the error message is Z-Zip cannot create temp folder archive Thats it Mozilla Support windows 7 downloading thunderbird error message Cannot creat temp folder archive. sfhowes 2014-03-24 11:40:30.892744 I don't think Malwarebytes would cause the problem. Please state the exact error message and exactly what you are doing when it occurs. Start Windows in safe mode with networking and run TB. Select Help/Troubleshooting Information, click 'Copy text to clipboard', then paste it in a Reply box here (you can omit font, printer details). http://kb.mozillazine.org/Standard_diagnostic_-_Thunderbird