Windows 7 keeps exiting full screen randomly

The title pretty much says it all—every 15 to 30 minutes, my PC kicks me out of full screen while I'm gaming or watching videos. Games usually just minimize entirely, and with videos, the taskbar keeps popping up over the image... I could deal with it during a movie, but gaming? Forget it. Especially when you're mid-match in an online game. I’ve tried everything—killed most background apps, gutted my startup list, uninstalled anything even remotely suspicious, even ditched my antivirus and silenced notifications. Honestly, I'm running out of moves short of a total Windows reinstall, but given how many programs I'd have to set back up, that's a last resort. Anyone got a clue? I'm about two seconds away from chucking this laptop against a wall...

Have you gone through the whole ritual yet—completely wiping out those old graphics drivers, rebooting the machine, then heading straight to the manufacturer's site to grab the latest versions and install them?

I’ve been running these same drivers for a year straight—this mess only started about six weeks ago... I shut my PC down every single night, so don't tell me it's a restart issue, the problem's been hanging around for nearly two months now

It doesn't really matter if you've been running those same graphics drivers for a year now—honestly, just wipe them out, reboot your PC, and then grab a fresh install from the site to see if that fixes things.