My mouse pointer started moving by itself

I don't really know if this forum is the right one but i need help. I was just using my computer normally and all of the sudden the sound that Windows does when a new device is plugged in plays, some seconds later my mouse starts moving without any physical input, I quickly shut it down but i don't know what to do next. Please help.

Bruce said:

USB mouse or wireless mouse?
either way, disconnect and try another if you can and see what happens.

if wireless, try replacing the batteries.

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I'm sorry, I think I was not clear enough. I have an wired. I have an wired mouse connected directly to my system. What happened was that there was a separate input after the sound that Windows does when a new device connects, I could still use my mouse but there was a separate input. I did not connect anything to the computer at the time that sound played, and the separate input wasn't just random drifting or movement, it seemed like movement a person would input. This was more a concern for the security of my computer and that's why I don't know if this is the right place to post it. Sorry for my bad punctuation.

Bruce said:

have you tried turning it back on to see if it repeats?
the sound could have been Windows detecting new hardware or giving you a notification alert of something it was doing.
did you notice it doing a recent update?

as to the random mouse movement, don't know, but turn it back on and do some scans.
what protection is on the PC?

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I did turn it on and it has not repeated it since the first time, I did run a scan using Norton Antivirus and nothing was found, I was not doing anything that could prompt Windows to make that sound.