Photoshop :: CS4 Sudden Lag After Installing Tablet Driver?

So my PS CS4 had never lagged before, it was all running perfectly, all functions are going quickly. I was using the newest driver for wacom intuos 3, but with using a new driver, I had a weird pressure problem. It would only work with an older driver, so I uninstalled the newest driver and changed it into the older driver. But it won't work unless I trash photoshop prefernces (the ctrl alt shift thing) ...

Suddenly everything just turns laggy, although no pressure problem.. brush lag, text tool lag, everything, even moving the canvas window lags. I don't know how to return the old preferences, i tried increasing virtual memory from 4k to 6k mb, but no change. In performance tab I changed memory usage from 70% to 80% no change too.

I would like to try and change back to the newer wacom tablet, but i never found a solution to the newer driver pressure problem, everyone in some other forum suggested to trash photoshop preferences and change to older driver.. Ages ago, I did this in my computer, and it's running good, but recently I want to do it in my laptop, and it lags.
 
I'm using windows 7, 64bit.
RAM 8gb,
E and C drive are more than 100GB available.
photoshop version 11.0
openGL turned off (or on, no difference)
 
I tried uninstalling photoshop but no luck. I tried updating GeForce driver to the latest version, no luck too. (I'm using gtx 420m)