http://windows.microsoft.com/en-SG/windows7/products/features/system-restore
This has been in system a long time ago, since XP perhaps. While most of the time, we only hear about how this feature waste space and cause delay during installation, we had totally forgotten when it would become useful.
In fact, for me, even in the days of Windows 8.1, this feature prove to be useful. What actually happened to me was that I was migrating one of my PC from a ATI (AMD) graphics card to a Nvidia one.
It is no surprise that ATI and Nvidia driver would not play nice together. The fatal mistake was however my own. I had forgotten to remove the old ATI driver before shutting down and plug in my Nvidia card. After testing, I wanted to change back to my ATI card and this time, even when I remember to uninstall the Nvidia driver, it just give me the famous "Black Screen of Death" at the Windows 8 login. I had tried reinstalling the ATI driver (but it won't install when the Nvidia card is in) and install-remove the Nvidia driver, but it just wont boot up when the ATI card is in, but perfectly OK on the Nvidia. I guess it could be a "feature" so that you won't switch back to your own card... LOL
Anyway, in the end, during the boot option, I click "Advance Option" and decided to try a System Restore, fortunately was just before the swap since the Direct X was updated. Guess, what? It solved all the issue and I got it up on the very next reboot (even though System Restore did took a while).
So, ask yourself is that little bit more of HDD space worth it? To me, definitely, since HDD space is cheap nowadays and System Restore actually manages itself not to overuse the space anyway. And one thing is for sure, I would add more restore point in the future. And lastly, Thanks Microsoft for implementing this nice feature!
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