In the device manager, do the Ethernet and wireless adapters say that they are working correctly or do they have yellow exclamation or just are not there. You may need to reinstall those drivers.
If they are okay, then you need to go into your adapter settings and insure that Windows is automatically obtaining an IP from the gateway, unless you have them specifically set up in the router with static addresses, then you would need to enter those in the adapter settings.
Also with the wireless, you will need to set the correct security type and re-enter the security key.
What Windows version, Win 7?