Navigate to the Control Panel in Windows XP by left-clicking on Start, followed by Settings and then choosing Control Panel.
In the Control Panel window, open Display.
Note: Depending on how your operating system is setup, you may not see the Display icon. To correct this, click on the link on the left-hand side of the Control Panel window that says Switch to Classic View.
In the Display Properties window, click on the Settings tab.
Toward the bottom of this window, click on the Advanced button.
In the resulting window, which may or may not be tittled Plug and Play Monitor..., click on the Monitor tab.
Locate the Screen refresh rate drop down box in the middle of the window. Under most circumstances, the best choice is the highest rate available. Depending on your issue though, the rate may need to be lowered.
Note: It is always recommended to keep the Hide modes that this monitor cannot display checkbox checked. Choosing refresh rates outside this range could damage hardware.
Click the OK or Apply button to confirm the changes. If prompted, follow any additional on screen directions.