"thunderbird.exe has encountered a problem and needs to close. We are sorry for the inconvenience."

i've been using TB portable off my flashdrive for almost a year, and i love it. all the sudden, now when i try to run it on any computer, it encounters a problem and needs to close.
i have various add-ons and themes like bloodthunder, reminderfox, and thunderbrowse. my internet is being to slow to do a thorough search before posting, i swear. i also realize that i posted a very similar topic 9 months ago, but this is new. i'm not sure what update i'm running... and i'm having trouble downlowading the latest one from here.
thanx for any imput...