I wish I could. I get the same error.
I've tried searching the forums, and I see a bunch of mentions of a C++ Runtime error, but when I click on the link, it just takes me back to the topmost forum page, which kinda seems to defeat the purpose of a Search function to me...

I'm sure it's an interface/operator problem or somesuch, but I sure wish I could see those threads.
The two most likely culprits are both cited in the Technical FAQ: There's a Vista incompatibility issue and a known conflict w/Nvidia drivers. They hope to have the Nvidia bug fixed with their next driver update.
I only wish I could find any documentation of how to know if these are my errors or not. Oh well, if I don't get a remedy after a while, I'll just submit it to the Ironclad guys like the forum directs me to!