Well this is fun, seems like Trixx decided to kick my GPU in the sack...I can't mine without my driver crashing. Current .bat:
cgminer --scrypt -o URL -u user -p pass --shaders 1792 --intensity 15 --worksize 256 -g 1 --thread-concurrency 21712 --lookup-gap 2 --gpu-engine 1100 --gpu-memclock 1550
Intensity at 15 because it'll cry about invalid nonces every line.
If your drivers are crashing try lowering the GPU-Engine by a little. Try 1050, 1000, and then slower decrements (like 990, 980). I found that mine works at 980 but crashes with anything higher.