How will you copy the files if it won't boot? ndis is the network driver, you can boot the system with a Linux Live CD, check the startup files for the driver and then download and copy the driver files you need to the right location (location would be listed in the startup files that load the drivers, check autoexec.bat and config.sys.
Here is an example of what you will see
http://support.microsoft.com/kb/190303