I'm back! Can't believe this turned into an IT support thread! Thanks everyone for your help.
I found a solution!
It wasn't Chrome
It wasn't an earlier version of Flash
It wasn't CPU ulitization
It wasn't decrapifier
It wasn't UAC
It wasn't defragmentation
It was.....
(drum roll)
...plugging in a MOUSE!
Instead of using my touch-pad buttons, I took the advice shared here and plugged in a basic HP mouse and ta-da! It seemed to work better.
I can't hit the center line as often - mostly because I'm not used to it yet, but did shoot some decent rounds (for me) yesterday.
So, thanks to everyone for your help.