I'm blind, help!

Ever since I installed MxO on my new machines, I've been getting this once in awhile, and tonight it just kept on going.  Here are my computer specs

Windows Vista
AMD Athlon 64 X2 dual core processor 4400+
2 GB RAM
NVIDIA GeForce 6150SE nForce 430 (with the latest driver)



Does anyone know what's going on?