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Set Duo core to single?

Update:11-30Source: network consolidation
I require the ability to run with a single core due to a certain conflict with Duo Core running and need some help on how to do this...if possible.
Bios v2.2
CPU:Intel Pentium Dual Core E5200 Processor BX80571E5200 - 2.50GHz, 2MB Cache, 800MHz FSB, Wolfdale, Dual Core, Retail, Socket 775, Processor with Fan.
I'm told this should be done within the BIOS but can't find that feature.
I know this takes away from it's ability but I require it to be single core until I can get a new different PC single core setup

The Best Answer

I am not sure I am quite getting the point of doing this, as Single Core Operations usually just run on one Core to begin with and you should be able to restrict that application or service to one Core by simply using the Device Manager.
You cannot really turn off one of the processor's cores independently.  All you can do is to trick the operating system into believing that there are no two cores.  Usually, you would do that by forcing an uni-core HAL during Windows Installation.  
Which Windows Version are you using?  If you are using Windows XP, set MPS Table Version to 1.1 in BIOS and see if XP is able to automatically adjust to the changes.  In Vista, there is an advanced Boot Option named "Re-detect HAL" or something like that.
If you are using XP, have a look here:
Your current HAL should be ""ACPI Multiprocessor PC," ACPI APIC MP HAL (Halmacpi.dll)".  Changing the MPS Table Version (MPS = MultiProcessor Specification) from 1.4 to 1.1, should yield the ""ACPI Uniprocessor PC," ACPI APIC UP HAL (Halaacpi.dll)" HAL.