Yes, it's a hardware issue (graphics card). The problem cannot be easily solved, though (because Windows 7 starts acting up even more weirdly if I try). The point is, an intelligent OS should be able to handle situations better than with BSOD in 2013. Even so, I'm satisfied with Windows 7. It's a buggy OS, but I've always expected Windows to be buggy by default, so no surprise there.
To get back
on topic: iOS 7, due to non-delivered alerts and notifications, started reminding me of Windows bugginess in recent weeks. I hope that this is not the future of iOS...