lowercase

I recently had one of my computers start displaying in all lowercase and was wondering if anyone knew what this might be from. All network computers are on AD and I havent made any changes at least that I'm aware of.

Hi, I would like to rename a usb stick. If I click on 'This PC' in explorer I can see the stick and if I try to rename it I partially succeed, the name changes but even though I type it in lower case and it shows up on the screen in lower case when I apply it I always get the name in upper case...