i cant connect to the internet and dont have sound. How do i fix it.

Dimension 4700
P4 2.8 ht, 512 Ram
ATI x300
soundmax intergrated digitial audio
Broadcom 440x 10/100 intergrated controller as my network adapter
Dell Inc. 0T6229 A00
intel 915P Workstation (82915P MCH + ICH6R) PCI Chipset