It may be caused by a (incompatible) theme you are using .
Close Thunderbird.
Goto start > run , type
"thunderbird.exe" -safe-mode
It will open Thunderbird in safe mode with default theme . Does it works
now ?
> Can I uninstall it in Add/Remove programs? Would I lose all my stored
> email messages if I do that? I'm running WinXP on a Dell laptop. I
No , you will not as Thunderbird always keeps all user data in a
separate folder , named profile folder.
BTW , you should back up your Thunderbird profile folder before trying
to reinstall Thunderbird.
> still have the Thunderbird Setup 1.5.0.10.exe file I downloaded &
> installed 4/07. Could I re-install that version? If so, how. Please
> help. Thanks!
>
>
If safe mode fails to work then please reply back and we will provide
further details about reinstall .