I started to play some Diablo 3 earlier today, and a little windows message popped up saying "Diablo 3 has stopped working". Same error message that comes up when you open up too many internet tabs and it can't handle it all. I run windows 7, I've uninstalled the beta and I've reinstalled Diablo. I'm not sure what's going on, but this doesn't seem to be happening for any of my friends. Any suggestions?
Right click the DIII icon on your desktop and click Troubleshoot compatibility. At Select troubleshooting option, click Try recommended settings. It should work. If it does make sure you click next and click save settings for this program. I was having the same issue and it worked for me.