I have been using ACT! 6 (126.96.36.1999) for years on XP without any problem.
Suddenly, when I use ACT! Email, it crashes when I simply select a message, or, after attaching a message.
The error I get is: "An unhandled win32 exception occured in ActEmail.exe "
I tried un-installing and re-installing but the problem is still there.