Blender doesn't start

So, up until recently, everything was working completely fine. Today, a couple of days after I installed 2.66, Blender doesn’t start. Just the cmd windows shows up, and exits immediately. I have an Intel C2D 2.66, and an ATI 4550 1 GB, and Windows 7 64-bit. Also, there is a blender-crash.txt file that says “# Blender 2.66 (sub 0), Revision: 54697”. Help anyone?

Never mind, apparently the latest snapshot works just fine.