slow computer and blue screens

[Windows Central Question]

My wacom intuos tablet stopped working and I dowloaded the newest driver but that one didn't work as well as the last driver. So I uninstalled it an took the old driver form the recycle bin ( big mistake). I reinstalled that but it only just crashed. I uninstalled it but I see file called "wacom.pensys" when I search wacom in the pc. Is that normal?!
I stared getting a slow laptop and blue screens and something like "explorer.exe unknown hard error"
I really screed up this time with the drivers but I don't know how to fix it and I'm not good with computers. Pls help