Was this a "clean install" or did you use Lenovo's Rescue&Recovery downgrade disk set to install XP?
Either way, the most important part is to get the LAN (wired) working, then install System Update and let it do the rest for you (you will need Microsoft's .NET 2.0 for System Update to work!).
Right, so download the LAN drivers for the T60p from Lenovo -->
hereNotice the "installation instructions" at the bottom of the page, follow the steps carefully, and you'll have a fully working wired connection. Keep in mind that the package will only decompress into a different folder on your C:\ drive, so the LAN drivers will not just install on their own. There's an extra step involved. The installation instructions on that page explain it all.
Next, download and install Microsoft's .NET Framework 2.0 from -->
here- Remember, without this, System Update will not work
Next, final step, download and install Lenovo's System Update found -->
hereAfter installing that, you should be set. Start System Update and it will install the other drivers for your machine.
Hope this helps!