Help!!! Windows 8 problems

Try to update the mouse and keyboard drivers

"I only just started using a new PC that came with Windows 8.1 preinstalled" after I read that,I understood ur problem...its not the windows,you bought a prebuild PC :D u literally did the worst thing u possibly could.NEVER-EVER-BUY-PREBUILD-PC's ITS NOT A LAPTOP just saw the PC specs - seriously intel hd 4600?also windows 8 not 8.1? why did u type 8.1 when its 8 not 8.1...

Dude,you don't have a dedicated video card...that's the problem...I wonder how it still runs though...:P

Install this:

• Intel drivers (from website)
• Directx

Lower resolution (try to play in the lowest graphical settings) to be safe it's not about performance problem.

Also, I played csgo in my Windows 8.1 tablet/laptop, It doesn't even have an i3, It has a little cpu.. Zxxx I don't know the name.
But the videocard is integrated too, intel HD 4000 and I can play csgo in 720p @ 30 fps without too much lag, so..

Run OS cleaning from all the preinstalled complimentary garbage? :|

Yep, it isn't windows 8 that is the issue, it is the lack of dedicated graphics (especially for BF4) and most likely too high of settings on CS:GO, though I don't have too much experience with that title.

You PC is not for games, is for multimedia and documents, buy yourself a GPU and problem solved. If you used previously a PC with Win 7, it had dedicated GPU then. Win 8 has nothing to do here, your problem is you don't have a dedicated GPU.

Even a GTX 750 would be great for you, seeing how much you know about PCs. It cost just 110€, also, how much your PC cost to you?