Virtual PC SP1 Networking problems

There have been a number of people reporting that when they start a virtual machine - they get the following error:

The
network adapter with address "00:00:00:00:00:00" of virtual machine
"...." failed to initialize because the address is a null address.

To fix this problem you should use REGEDIT to:

Examine
the key value at
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\<nnnn>\DriverDesc
to locate the desired host adapter where <nnnn> is a four
digit number.
Look at the GUID value for the NetCfgInstanceId key value.
Add
the DWORD key at
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VPCNetS2\Parameters\Adapters\<guid>\Flags
and set the value to 0 where <guid> is the GUID found in
step 2.
Restart the computer.

If you want to see the details of this error see