Not Responding When Trying To Change Caching To Off In Device Manager

I need to turn off the hard drive caching I go to control panel, then hardware and sound, followed by device manager In device manager I double click on disk drives, right click on the hard drive which is C drive, select properties, then click on the policy tab I unchecked the "enable write caching on the device" When I click OK then I get the hour glass If I click on anything else then properties box goes to NOT RESPONDING I can not close it, even with task manager, it does not close I restarted the computer and nothing came up I had to put the windows 7 disk in and reboot, try to repair it but it did not work using the disk I was able to restore from a restore point and get the system running. but still have the same problem trying to turn off caching?