Sometimes when I exit the internet exploxer browser, it does not exit properly. It closes but something remains. Look in your task manager under processes for something like IEXPORER.EXE. Dont end process on EXPLORER.EXE though by mistake.
Also my verison was running very slow, so I ran AD-AWARE on the pc and this cleared up some of my problems.
My mouse becomes jerky if the object snap and snap mode buttons are both depressed at the same time.
My utilization usually runs around 20% cpu and 50% of my memory resources. I have a Dell Latitude D810 with 512k ram