Disable Hyperthreading when Windows 7 already installed. Possible without reinstallation?

I have a quad core i7 with windows 7 Enterprise installed. I run a lot of single-thread programs for heavy calculations, so the multithreading is really costing me a lot of time. I can only use half of the cpu I could use without hyperthreading (12-13% instead of 25%). So I want to change this.

Now I've read on multiple fora that you have / have not to reinstall your Windows to change that hyperthreading. So I come to you : How could I approach this best, without losing stability (which I highly need), without unpleasant side effects, and with the least amount of effort. Reinstalling everything will take me a couple of days, so the boss really likes it if I don't have to.

Cheers

 

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Last updated July 18, 2019 Views 49,990 Applies to:
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Played around a bit yesterday evening anyway. Disabling hyperthreading in the BIOS worked, and no strange things are happening to my Windows. So I can confirm, on a i7 quadcore with Windows 7 Enterprise, you can just disable the hyperthreading without having to reinstall Windows.

As expected, R runs a lot faster (depending on the tested code between 1.5 and 1.8 times faster) and is using 25% of the total CPU (thus is using 1 physical core now.)

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