Exec the setup and set for instance 1000 hz, then set ok or accept a lot of times, the close and check if changed, if not do it again, some prompt box should appear... just do it like 20 times.
Did you make everything like in instruction? Cause it's really simple. If you have some problem, you can write here. For example I hadn't usbport.sys in my pc, but i searched in google and there was everything. So what's the problem bro?
http://www.gamefront.com/files/14174209/Mouse-Hz-Changer---Mouserate-Checker---hiduspf.rar/
this should work.
Here you have everything what is necessary to do it ;]