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[ged25]

Once in a while, my mouse tends to stick to the left side of the screen. You can move the mouse up and down but not right. The pointer moves right but it automatically comes to the left side as if its on a spring.

I tried with a different mouse and it behaves the same. Even using MouseKeys from Accessibility Wizard doesn't help. You can move the pointer up and down using the arrow keys but if you try to move right, the pointer immediately returns to the left side.

The mouse behaves fine when you restart.

Can someone please tell me why it is behaving like this ? Its happened a couple of times now.

[LuthfiHakim]

It is possible that you have been infected by a malware (virus, trojan, etc), because it's possible to "control" the mouse through coding by modify mouse messages. See this tutorial for an example of implementation for this mouse "controlling".

My suggestion is to start Windows in safe mode to avoid running any third party programs/drivers when you logged on. In safe mode you can check your mouse behaviour. Check several times (logging out and logging in back again in safe mode a few times). If in all safe mode sessions the mouse is acting properly then you definitely infected by some malware. It's possible that the malware was written poorly resulting that weird mouse behavior.

Oh, while you are in safe mode, you may want to remove any autorun programs to avoid that malware gets activated again. You can use a startup manager like Start-Q to do the removal, and then run antivirus to find out what malware infected you.