Network Problems

[fishoutofwater579]

I'm having problems with my network. Everytime I boot up the computers can no longer see each other on the network. I'm using a net gear 5-port switch and both computers can see connection, but the secondary can't renew it's IP address. When I try to repair the connections the IP address can't renew. How can I renew the IP address or make the main computer the DHCP Server?

[fishoutofwater579]

also if I try to repair the connection on the first computer it says that TCP/IP is not enabled I am totally flustered and don't know what to do. It has worked before and won't know. Please Help me