Kernel crashes...

I've got two kernel Oopses (attempt to dereference null pointer). This is very annoying. It could be bad memory or overheating, but I think it is just a buggy driver, possibly the graphics or the WiFi driver. I really don't want to go into the whole mess of recompiling your own kernel but then... BTW I bought a 8Gb SD HD card and I can't read it with my old USB driver. I think I'll just back up the whole image and do a network install of eeeubuntu thru TFTP.