Boot into DOS, make a subdir and copy there all nic's monolithic drivers.
Form there you have to load first a .sys file into your config.sys (the boot disk) in order to load the driver.
Once the driver is loaded you have to load the shell's drivers nic card. Usually these files are .exe files.
Depending on the type of network you have (windows (lan manager), domain, netware,etc, is the set of drivers that you nned to install.
Under a typical driver structure, you will find \dos \windows\ winnt\ \xp directories, you should take the drivers from the dos subdir.
Mail me the driver name and I could help you more..