Hello FunkaRoos.
First, what is the make and model of your keyboard and mouse? I'll need that info for more troubleshooting. As it is, you might have problems with the drivers for those two. Assuming you are runnign Win 8, you need to go to Control Panel>Hardware and Sound>Devices And Printers. Then, double click your keyboard/mouse on the screen. A page should pop up desribing your item selected. At the top of the window, change to the Hardware tab. Once there, on the bottom right of the page there should be a clickable button called "properties". Click that, and select the drivers tab at the top of the page. If possible, select update driver. If not possible, uninstall, then unplug and plug your mouse/keyboard back into your PC. Good Luck.
Electonic