Mouse Lag while doing even the most simple of things- like.. windows running- going to "start" the cursor will jump and be jittery.
Oh and for the sticklers- the "show processes from all users" is not selected- I know- but selecting it shows NO additional info- same amount and same ones.
OK, I'm Going to try and help, but I'm not the best at this.
Is your mouse wireless? Does it need special drivers to be installed in order to be used?
As for some of your graphical/audio problems try Start>Run>dxdiag and see if there is any issues or problems with audio or video hardware.
And The "show processes from all users" is normal, More processes will show up only if you are logged on to more than one account at a time.
Another thing you can try is downloading this program called CCleaner.(download the newest verson)
Download CCleaner 2.01.507 - filehippo.com
after you install the program, you can select the tab called "issues" , then "scan for issues" then "fix all issues" and that might clean up a few small errors that are goin on.