What you need to do is download Disk #2 from the Support section of the 3C905C-TX NIC section. In that ZIP file, there resides the .DOS file necessary to load the NIC. Read the documentation that comes with the ZIP file.
Also, don't forget to turn ON PnP Support within the BIOS. Or set NO PnP OS INSTALLED. Let the BIOS assign the resources to the NIC.
If you need any further assistance, let me know and I can email you some sample disks that have driver support for this tpe of NIC.