Applikation to overclock my notebook (acer)

I’ve got an acer aspire 3000. The CPU is a amd sempron 3300+ 2,0 ghz. Unfortunately my CPU is getting to hot and is restarting my notebook every time I use a heavy CPU applikation in a longer time.

What I need is an applikation which can underclock my CPU to about 1,8ghz. It would also be nice if someone knows an applikation which can enable my fan to be always enabled on full speed.

Thank you.

Have a look in the BIOS settings to see if the built in temprature settings can be adjusted. It might be that one of the fans inside is either full of dust or not working properly. Have a look here and see if any of these proggies will shed any light on what’s going on.