For the last two days, a couple of co-workers and I have been having intermittent problems of all of a sudden selecting multiple files when we only want to select one in Windows Explorer and even though the Caps Lock key and Num Lock key are not showing it everything we typed kept coming up as if the Shift key was pressed.
We ran virus scans, spyware scans and everything else we could think of with no luck.
Finally I thought to change the batteries in the wireless mice. That was it, problem solved, at least there were no re-occurrences since that time yesterday nor so far today.
This just reminds me that the solution to a computer problem is not always that involved, I just have to figure out the cause and then the solution is usually rather simple.
If you are having similar problems, try changing the batteries in you wireless mouse first, it just might save you some hassles. By the way, the wireless mice we had still had the original batteries and were about six months old.