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Try a different mouse.
Laptop = Make sure the TouchPad settings are configured to where this gets auto-disabled anytime a Mouse is plugged in.
> Sticky Keys
> Mouse Keys
> Mouse Snap-To or Visibility
If you have any Controller actively connected, always disconnect this when not using. Or ensure it is not setup to act as a point device for Desktop Mode; which can make a game controller work like a Mouse.
Same thing happen to me. When steam client is launched mouse cursor start to move to the upper left corner of my screen at random time. This only happen when the steam client is started, if not mouse operate normally.
mouse is MSI DS 100
Windows 10
Do you have any Game Controller connected?
where my Logitech G502 was all erratic and jumpy only in older games.
And furthermore that it wasn't always like that.
I'm not sure what I did or what happened to cause the change but suddenly one day the entire Penumbra series had the problem, and Serious Sam HD, and several others.
Tried everything I could think of, but those games remain unplayable for me.
Newer games are all fine.
The thing is when those games (and/or Steam) are loaded, they will load certain drivers and/or settings for peripherals like your mouse.
I have a couple of games where as standard the mouse does this. I simply adjust the sensitivity and it stops.
It can also commonly happen if you have a controller connected at the same time, or if you've previously had one connected and something still thinks it's there as well.
So, although I don't have any defeinitive solution, don't assume it's just something within Steam that needs fixing. It might in some cases, it might not at all.