Update: used a disk image to put the PC back to how it was a little while before I installed ME. Battlefront once again appears to be working fine (fingers crossed). Installing ME must have changed something, reluctant to bother reinstalling it...
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I read reports that some games install a dunuvo drm copy protection driver thingy and its giving some setups stability issues
Well, it's starting doing it in Battlefront again, can't play more than 5 mins before it crashes. Since I know the pc has been reverted to a time when all the software seemed to be working, I'm guessing it must actually be hardware.
Assuming the graphics card itself is the most likely culprit? Saw PSU mentioned, but since it's a decent make and it's not old, I'd hope it's not that...