Can not locate net work adapter
The hard drive contains all the necessary drivers that makes the computer function and that includes Internet connection. When you installed the operating system and all other software it does not mean you installed the driver for the motherboard which contains the drivers for the LAN.
Run the drivers CD that came with the motherboard. If you don't have the CD. contact the PC manufacturer for the driver CD. Otherwise, you can purchase an add on NIC(network interface card).