Having to use a mates computer atm and hes got the screen completly shitty and everything is just 50x the size it should be. How do i change it back to normal size?

Change the screen resolution...in display settings

Lol.

Right click on desktop, go into properties, click the 'Settings' tab, Change the slider for screen resolution.

Click apply till you get the right one.

Yes click right click on desktop and then choose properties and then go for settings which is on top and the last option, now see down below monitor in that box. there should be a scrolling type bar which is in horrizontal, scroll to your preferred resolution and then click apply and then ok.

That's simple.

lol noob , or go into advanced display and change the dpi settings.