So after my last exam I've cleaned up my desktop and fixed my computer so I don't have all sorts of files everywhere as well as taken back up of my stuff.
It has been a while since I last took a look at it, but I see now that for some reason Windows Experience Index shows up as unavailable. I've tried to just update it and it ran the test but nothing happened.
I'm wondering why my computer suddenly won't show the data. :-/
The WEI scores disappear when Windows thinks you changed your hardware. A lot of driver updates, especially GPU and chipset, will cause a reset of WEI. BIOS updates or some BIOS settings that have to do with your hard disks (going from AHCI to RAID or Legacy mode for instance) cause the issue as well.
"The computer programmer says they should drive the car around the block and see if the tire fixes itself." [src]