Over the last few days I got a number of requests on the microsoft.com help alias for customers trying to locate the VMNET Driver which is used by the Microsoft Device Emulator to enable to networking scenarios on the emulator.
Instead of making just this driver available as a standalone driver, at this point we recommend that you installed Virtual PC Software which includes this driver. The VPC Software is available as a free download from Here.
Our current download page will also be updated to show you this information very soon so that you don't get the "download is unavailable" message.
By doing this we are ensuring that you always get the more up to date version on the driver on your machine and is in sync with the main product that ships this driver.