I am using a laptop with a realtek8139 integrated adapter. When I boot the live cd (Puppy), I go to configure the internet connection, and shows the module for the card has automatically loaded, and I just set it to DHCP and that is all. After installing the os, however, I go to configure the connection, and it tells me that no module has been loaded, so I should manually choose from the list. When I do, it tells me that it failed to load. I have also tried allowing it to probe by loading every possible driver, to no avail. I have reinstalled the os twice, and it does not recognize the adapter, but when I boot live, it works fine. Any reason why it would do this?

Don't know why it would install differently, but run lsmod on both and see what is missing. Load it manually.