Issue:
When I plug any USB key - which does not include mice using usb ports or any hardware whatsoever, it shows for a few seconds and then disappears and then just starts flashing making my system go insane.

Notes:
This does not affect my alternative user account.
If i'm quick enough to enter the USB key, the window closes.
If I am quick enough to enter the USB key and open a file, it does not close and USB stops flickering.
Using Windows 8.1

Possible cause:
Registry issues

Solution:
?????