I have an MSi Ge70 0ND UK. This is a gaming laptop and therefore has a Turbo boost that activates when I open a game - it clocks the processor up to 2.4 Ghz I believe. The problem I have here that Windows 8.1 completely breaks this and if I launch a game for example Minecraft, it runs at 30 frames per second instead of a respectable 200. I know for a fact that this is a Windows 8.1 problem as it has happened before and I managed to revert back to a last known point, which restored my PC back to Windows 8; after this the Turbo function worked perfectly fine once again. The main issue here is I wasn't given the option not to upgrade to Windows 8.1. I received a pop up on my screen asking me to upgrade, which the options of: 'Remind me later'; '4 hours'; '3 hours'; '2 hours' and '1 hour'. I chose 'Remind me later' because I didn't want to upgrade due to last time. Later, I got the same pop up without the Remind me later option, therefore I HAD to upgrade to Windows 8.1 without a choice and can't for the life of me remember how to restore back. Summing up, I would like an explanation on how to restore PC to last known point and would also appreciate an explanation on how to say no to upgrading again. I am very annoyed with Windows for forcing the upgrade and quite frankly think it's stupid. Thanks for the help.