I’ve been running in to annoying crashes in IE 7 where I get a bothersome dialog “Runtime Error! This application has requested the Runtime to terminate it in an unusual way.”
One of the cool tricks with IE 7 is that you can start it without any add-ins enabled, at least under Vista. (Start -> Search -> Internet -> select “Internet Explorer (No Add-Ins)” ) Once you’re at that point with IE up and running, select Tools -> Internet Options -> Programs -> Manage add-ons. Disable the add-ons you think might be troublesome and re-enable them one at a time.
I finally isolated my particular issue to the Omea plugin from JetBrains.
Phew. At least one productive thing solved today!