Using A Refresh Rate Higher Than 60Hz: How To Remove The 60Hz Cap, Or Make A Custom Monitor Driver That Will Allow It

I've been reading around for quite a while now, looking for an answer to my problem with no luck in sight (so far). I've recently upgraded to Vista using a dual boot setup with XP. I have a 42" Sharp Aquous (1080p) display through DVI-HDMI. In Windows XP, using the default "Plug and Play Monitor" driver, I'm able to use 75Hz or 85Hz at 1920x1080 (which the monitor does support). In Vista however, with the "generic pnp monitor" driver, it won't allow anything other than 60Hz, regardless of the 'hide modes' check box. Now, some people would say that 60Hz should be fine for an LCD monitor, but here's the problem. With 60Hz, for some reason, the actual screen display size is somewhat smaller than the actual screen size (about a 1-1/2" border all around) which was the case in XP as well (issue with the sharp display i suppose). In 30Hz, the display size is perfect (just as in 75 or 85Hz), but at 30 it becomes very blurry and terrible with any motion on the screen. So basically, I can only use this monitor at either 75 or 85Hz.

This has to be a Vista OS problem (and not at fault by the ATI display drivers). I've read that some people have had similar problems with their CRT monitors as well. Some have suggested using refresh rate forcing programs, but since they were all made for XP, none of them work in vista (I've tried reforce, refreshlock, pstrip and reschange). how to remove the 60Hz cap, or make a custom monitor driver that will allow it?