I am running Windows 7 x64. The regular version of IE9 beta crashed for me just like you. However, if I ran the 64-bit version instead of the 32-bit everything works perfect.
This isn't going to work for you. However, it may work for other people
I only had one crash on IE9 beta and tht was on a website, when my AVG 9.0 tool bar checker kicked in on that site due to a online drive by download. otherwise 32bit and 64bit versions of IE9 beta on windows 7 haven't crashed. Depends on your computer, hardware and programs. I say differrent results for everyone in this Beta. Oh I can't log into some banking sites with IE9 beta.