Maybe it does have something to do with multiple patches being done at one time? As I said, I was up to date before restoring my computer, and installed 1.5 with no problems. Now that I installed every one, I'm having problems. I may test it out later on today when I get up. I'll let you know.
I have an ATI card, as well. It's a 5400, though.
Edit: I have another question for you. Are your games physical copies? If so, did you install them manually or through origin?