Wish I could help, but this was just one of a host of problems I had with Windows 7. My solution was to get rid of 7 and go back to Vista. That one action alone solved about 110 different problems I encountered in just two weeks.
Can you open the Event Viewer, and see if you can find more information on the crash (on the timestamp when the crash occurred)?
I have exactly the same problem with Windows7 (64 bit version) and Chrome beta since I updated the Adobe Reader. It was working perfectly fine before. What I can see from other posts is that this problem happens accross all browsers. Hopefully Adobe will fix this bug ASAP.
BTW I love WIN 7 and didn't have any problems with it. Would never go back to Vista...