I don't think that the mouse is a cause, more a symptom of your problem
It seems as if your pc is slowing down / pausing for some reason: lack of memory (RAM) is a common cause.
Check what is running via the task manager - there are many programs loaded at startup which are not infact ncessary.
Go to start, run and type
then under the startup tab, untick anything that is unnecessary. If unsure, ask here - people will give some suggestions.