Slow network in Windows 7 Virtual PC? Speed it up!

As you probably know, Windows 7 comes with an optional component that allows you to create a virtual PC within your real computer. The virtual PC can have a different operating system that you can use independently of the real PC. The virtual PCs come very handy if you need to use some old program that was not updated to work well with Windows 7. Or, if you want to have a virtual sandbox to try things out without worrying about messing up your real PC’s configuration. We, for example, use virtual PCs extensively to test our software on different version of Windows.

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With Virtual PC software you can even set up a virtual network and use it to transfer the files between the virtual and real PCs, back and forth. However, in some situations the transfer of files through such a network occurs very slowly. For example, when browsing the shared folders of the host computer from the virtual PC, it can take a few seconds just to display the contents of a folder. When trying to transfer a file from the real PC to the virtual one, the speed of the transfer may become very slow.

If you experience such a problem of a slow speed of the virtual PC network, you can try the following solution that may solve it:


This file contains a tweak to the network settings in Windows Registry that may solve the slow network problem. How to use this file:

  1. Create a system restore point, to be able to revert the changes, if anything goes wrong.
  2. Right-click on the link above and choose Save Target As (or Save Link As) and save the file somewhere on your hard drive (of the real PC, not the virtual one!)
  3. With Windows Explorer (or AB Commander) navigate to the folder where you have saved the file and double-click on it.
  4. Confirm that you want to import the file into Windows Registry.
  5. Restart the host computer.

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Disclaimer: This tweak has solved this problem for us (and for quite a few other people), but we cannot guarantee that it will work for you. Use it at your own risk! As always, it’s a good idea to backup your computer before making changes to it.

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  1. Muchas gracias. Tenía ese problema y no encontraba la solución. Escelente artículo.
    Thank you very much. I had this problem and could not find the solution. Excellent article.

  2. I was using Virtual Pc on my Windows 7 but I was getting very slow network speed. This article helped me to solve this easily. It was very easy to understand and explained step by step.

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