There are several actually.. and depending on your laptop you cna pick from a few..
there are ones specific to Dells..
like I8kfanGUI for dells from
Dell Inspiron Inspiron/Latitude/Precision fan control
or for general use:
Speedfan from here:
SpeedFan - Access temperature sensor in your computer
I use this program: NHC or Notebook hardware Control form here:
Notebook Hardware Control (NHC) - Homepage, Downloads, Help, Docu, FAQ, News - www.pbus-167.com