I have a fairly old Compaq Armada 7800 laptop with an 'EasyPoint III pointing device' (a little knob just above the 'B' button). The operating system is Windows NT4 SP6a. The cursor has, in the past, been inclined to wander a bit when it should be static. It has now gone berserk! If I move it, for example, to the left the cursor shoots across to the left hand side of the screen and reacts as if it is attched to the side with a piece of elastic. I tried using an old serial mouse. This is much better but still occasionally the cursor wanders or flies across the screen.
My laptop has only been connected to the internet for very few, very short intervals. Although I have scanned it for viruses, I have never run an adware/spyware checker on it. Today I did so and found I had entries in the registry for 'Alexa'. God knows how it got there! I let AdAware delete the entries. Spybot picked up a related html page which was also deleted.
I also deleted the registry key for 'loadqm.exe' after checking through the 'run' entries.
My mouse is now behaving itself. I don't know which of these actions sorted it out. It seems too much of a coincidence for the cure to be unrelated to either of them.
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