I personally find the drivers from www.tweaksrus.com
to be the best for Nvidia cards. They are tweaked a bit to run games better. THe higher the refresh rate the better, so 75 will be clearer anyway than 60. Do u have a TFT or CRT display? The blurryness could be an option set incorecctly in the monitor options. Or its possible its a gamma/colour problem. U can change the settings in the control panel for colour and gamma settings for the card. If one is too high or low, then itll make some areas bleed. Try and see if uhavent changed them by accident, so maybe try and use the default settings.