Thunderbird doesn,t fully open..lagging to view messages

Hello. My Thunderbird has been slow to pen,lagging while in it,and when clicking on messages,they do not show,and have to close it by right clicking the icon several times then waiting for it to close,then when reopening it,it says it is processing,and still open,and a box appears with an option to close the program so it can open again.I have done nothing to cause this.I have many important emails etc,and i cant uninstall the program,so i installed OE Classic,and was able to import settings from Thunderbird to it,and luckily i was able to export Thunderbirds setting to a 2.1 gn file that was the file i used to import to OE Classic,but OE Classic waits,and authenticates,and then i get a big error message,and here is the screenshot. I guess i,l try outlook express if its still any good for email(have heard /read otherwise) By the way i tried right clicking on the thunderbird shortsut,and selecting run as admin,and make it run in compatibility mode for win7,and thunderbird was fast for a day or two,but now its back to quicksand. Any help is appreciated. ThankYou, Screenshot....