I can understand your frustration, but I've not had anything like that happen. There have been days when I've been using B4a for 12-14 hours without rebooting and had no problems. (Win XP, 2Ghz Intel Dual Core. 4GB Ram)
Sorry that doesn't help you, If nobody else replies with similar problems it could be indicative of a hardware or software set-up issue.
It's not a graphic intensive program but it could be worth checking that you have the latest drivers for your graphics card, and that the graphics card and processor are not running too hot.
If that's all OK, I'd try re-installing B4A and the SDK (or maybe try that first).
If that doesn't sort it out I would then personally start checking the memory and disks for errors. And as a last resort, reinstall Windows.
It's a pain when PC's go wrong, and potentially a lot of work to fix. I hope it's something simple and you get it sorted soon.
Steve