Intermittant loss of Internet Access

I have one PC in my home which looses connectivity to the internet almost daily. A PC reboot is required to restore connectivity. It has Windows XP and is connected via CAT5 to a Verizon FIOS Actiontec MI424WR. All other PC's on the router work fine. Rebooting the router doesn't correct the problem. The PC network adaptor is configured for DHCP. When I run a test ... ping gateway fails...ping DNS fails...and "No WINS server is available for this connecrtion"
"Repair Local Area Connection" also fails. I cannot release/renew my IP address. I also tried uninstalling and reinstalling the network adaptor. No luck.
Any suggestions?