But in Windows XP, ClearType was disabled by default, so if you wanted to use it you had to turn it on. Some people might not like how this technology make their fonts look on their screen, and may want to disable it.

Disable Cleartype function following step;

• Right click at empty area on your desktop and select Personalize.
• And then Click ‘Windows Color and Appearance’.
• Click the link “Open classic appearance properties for more color options’.
• Press the Effects… button.
• From the dropdown menu under ‘Use the following method to smooth edges of screen fonts’ select Standard.
• Press the two OK buttons, and close the Personalization window.

Good luck;