Just to add my 1/2 cents worth; I had the same problem, and it was intermittent. I even had the closing programs and windows asking me if I wanted to shut down, all kinds of weird stuff and I thought my PC (mostly the mouse) was posessed. I too had the same mouse hardware setup. At first I thought it was a virus, or worse, someone messing with me using a trojan. To make my story short, the confirmed cause was in the next room. It was a remote control toy in use. I'm sure there are lots of other devices that can do weird things to a PC as well. I didn't change anything, I just stumbled on the cause when I realized that it happened only when the remote control toy button was being pushed.
Something to consider, at least as a last resort.
Something to consider, at least as a last resort.
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