Please give us more information on the network setup.  Is it using a wired or wireless connection?  Which model computer is having the problem?  Which version of Windows is it running?  Have you tried disabling the McAfee firewall temporarily?

Steve

Wired network, dimention 9100. Other computers on network run a mix of XP and 2000.
Basic network running thru a switch with ADSL connection. Connection to ADSL is ok. Other computers can access the computer.

Yes network adapter power settings are correct. Disabling the McAfee firewall does not make a difference.

When the network goes out, can you open a command prompt and use the ipconfig /release /renew command to get the network working again?   When the network goes out, do the link lights on the network adaper remain lit?

Steve

Can not get the network working using the comand prompt. The orange light remains lit on the adapter.

Uninstaled McAfee Security which came preinstalled and reinstalled the program.
For some reason it would not recognise the firewall settings. All settings are the same as before reinstall, but now recognising the settings.

Cheers.

Great!  It would be helpful to others reading this thread if you told us what the problem was and how you solved it.  Thanks.

Steve

I think I have finally got it sorted out. Thanks for the help.