Ran a little program called Complete Internet Repair. Cleaned up problem with windows firewall.
ATT router quit working. Set up Linksys WRT54GL router. Mcafee-Antivirus Plus program. Laptop connected wireless to ATT router. Laptop will not connect to internet wireless or hard wired to the  linksys router. It will not connect to internet hard wired to ATT modem. It will show a connection to the wireless network, but no internet access. Turned Mcafee firewall off. Made no difference. any ideas?   Thanks Herman
Inspiron 17R Wireless Problem