I am using Dell Studio 1558 Laptop. Installed with Ubuntu 12.10 It gets overheated many times and then system start to hang, how to get rid of this problem of overheating? Either i should increase the speed of fan ,if yes then how? if any other option then please suggest.
As you said you are using Ubuntu 12.10 so you can install Jupiter in it.
Once installed use it in power saving mode.
More information and complete tutorial: Solve Overheating Issue In Ubuntu 12.10