The new Windows XP interface is enabled by default in the Home Edition and Professional edition.
At some point, you may want to disable some of the new interface components in order to improve the computer's performance. This article describes how to enable or disable all or parts of the new interface in Windows XP.
NOTE: Enabling or disabling these components can significantly hinder or enhance performance depending on the hardware specifications of your computer. You can enable or disable portions of the new interface by clearing or selecting a check box:
Right-click My Computer and then click Properties.
On the Advanced tab, under Performance, click Settings.
To select all of the check boxes, click Best Appearance. To clear all of the check boxes, click Best Performance. If you select Restore Defaults, several check boxes are selected. The default selections are determined by your computer's capabilities.