Pinging computer's own IP address or name times out. Ping works on other wireless LAN's computers and on router.
Connection Properties shows "TCP/IP", "File and Printer sharing", "NW link Net BIOS" and "Link layer Topology discovery Responder" all checked, among others.
Computer cannot connect with other LAN computers but does connect to the Internet using Firefox or Mozilla; however IE 8 does not work.
Firewall on or off makes no difference.
ICMP table shows "Allow incoming echo request" checked.
The same problems occur with a wired connection to the LAN,; seems to rule out defective adapter.
Various diagnostic or repair tools do not remedy.
Any help greatly appreciated.