I have Windows 7 64-bit Home Premium running on my laptop; A message comes up that there is a problem...?

I have Windows 7 64-bit Home Premium running on my laptop. A message comes up that there is a problem in Microsoft .NET Framework version 2.0; then shortly thereafter, the screen goes black and I have to restart. I can use the system for perhaps an hour and the whole scenario repeats.

I have done a little research on this and am puzzled that v. 2.0 is supposedly intended only for Windows XP; so I ask myself, "Why is it on my Windows 7 system?" If my problem is due to some problem within .NET Framework 2.0, could I possibly uninstall it and run solely on .NET Framework versions 3.0 and 4.0?

I'd love to reinstall Windows and see how that benefits me but the DVD has been misplaced. So I am stuck with this installation. I just really hope that this is a solvable software problem as replacing the laptop is not so easy.

I sought to uninstall .NET 2.0 but it was not listed in Programs; only the 4.5.1 which has been installed only a few days ago. Since it was available, I uninstalled 4.5.1; the problem continued (not surprisingly). And I re-installed 4.5.1; still the 2.0 problem continues to crop up.

Until this problem came up, the laptop was performing as well as could be expected. It uses a 64GB SSD and 8GB of memory; it restarts in 15 seconds and is very stable... until now.