Double click of mouse not working in Windows XP

I recently could not double click on a folder and have it open the contents.

Run Regedit, find HKEY_CURRENT_USER/Control Panel/Mouse.
Delete the value data in DoubleClickHeight, DoubleClickWidth and DoubleClickSensitivity.

Go into Control Panel, Mouse, Doubleclick speed, move the pointer to a very slow position.