if you acer has the e button for acer emanager , press it and then click acer settings
you click boot options , then there is a selector to have the fan enabled,
if overheating is the problem your fan should now run full speed.
also , find the fan grill located at the side and rear of the computer and blow through it , the fins get clogged with dust and this prevents cold air getting in , use a hoover if need be
jase, December 2007