13.04 on Macbook, kworker crash, shutdown-Collection of common programming errors

Ok, so I hope someone can help with this. I’ve tried googling everything I can think of and I’ve come up with nada. I just installed 13.04 on my (white, older) Macbook, and I am intermittently getting this error:

http://i.stack.imgur.com/JBL5n.jpg

I tried to get the entire screen in that picture. When this happens, it causes a complete lock-up and I have to do a hard shut-down. It happens every time I use my computer, and it’s made it almost unusable. I only say its intermittent because it doesn’t seem to have any pattern. Sometimes it will happen instantly when I log on, other times it will take 3-5 minutes. Sometimes it’s while i’m online, sometimes no programs are running, sometimes a lot are, I can’t seem to find any correlation to anything. I tried re-installing ubuntu, this did not solve the problem. Let’s see…any other information….

I get a brief page table error when I boot up. It goes by too fast to take a picture.

Thank you in advance for any help that’s possible!