First rig I've attempted to update isn't working, Claymore crashes at

start building OpenCL program for GPU 0...

Seems to be a mix of the app force quitting, or the entire system crashing & rebooting.

Rig is running Win 7 with 4x 470 and 1x 380, with latest DDU used before driver install and pixel patcher + 6GPU mod used afterwards.
Same result using either ETH 9.8 (ETH-only mode) or ZEC 12.6

All cards are at default clocks, voltage, timings. Tried each card individually using -di flags, same result.