Have a look at the sample script in the Reclock folder. You don't need to install anything. You can change the script so instead of calling Powerstrip it calls your driver utility. In the case of ATI (which I think you have) you use it to switch profiles, so you need to create a profile for each refresh rate you want using CCC. Alternatively you can install one of the refresh rate cahnge utilities like Display Changer and call that from your script instead. There are quite a few example scripts knocking about in this forum. But, as I said, I don't think any method other than pstrip works with mpc-hc, on W7 at least, and pstrip (even if you wanted to use it, which I know you don't) does not support the 5xxx series.