Yo,
Noticed my previous post wasn't conclusive...
When i right-click the units with yellow warning triangles and click the "more information" button, it just says "unknown unit".
However, the problem has intensified a bit. The USB mouse freezes perhaps once every 5 seconds, and eventually stops responding. The trackpad works just fine while this is happening.
One time when the USB mouse was frozen i got a yellow triangle in the "HID tree" on "Microsoft Hardware USB Mouse". The information read "the device could not be started", or something along those lines (i was not sober and did not print screen). Unfortunately i havent been able to recreate that scenario again, but i'll keep working on it.
I guess it's a possibility that the mouse finally gave up though.
/Fancypants