Network errors with windows xp sending packets but not reciving

I have a realtek ethernet card in my desktop and windows can see that the network is there, and knows when I disconnect the cable, and send packets, but it doesn not recieve any, and I cannot get onto the network. Tryied switching the port I am hooked up to but that didn;t work, and I know the cable is good, any help would be appreciated

Do you have a firewall running, such as the one with SP2 installed?

I;m not sure, where would I check that out at? and possibly diwsable it?

i'm just gonna reinstall xp

1. Start, Settings, Network Connections
2. Select 'Local Area Connection'
3. Select File, Properties
4. Click Advanced tab
5. Click Settings
6. Untick option for Firewall