How To Enable Hyperthreading

I just purchased an Inspiron 5150 3.06gHz Mobile Pentium 4 with the 852PM chipset and A31 BIOS.  I did not have Dell enable Hyperthreading by default since I did not know if I would need it at the time, but I have since found out that many of the audio tools I use (professional audio software instruments & recording tools) will benefit greatly from Hyperthreading. I have read that in the past certain Bios's and certain versions of the 3.06 were not capable of hyperthreading, but all of the information I can find now regarding the latest version of this processor/chipset/bios leads me to believe this is no longer the case, but just that Dell offers the option of switching it on.  However, I do not see the option in my BIOS. 

Does anybody know how to enable Hyperthreading? Is there anything I need to download from Intel?

Thank you