We have a Toshiba P200 laptop and have been connecting it wirelessly to a computer in another room for the internet. The laptop runs Vista Home Premium. For months it has connected to the internet fine, but now it refuses. In control panel-networks & sharing CENTER we get limited connectivity or LOCAL connectivity. In wireless connection STATUS we get IPv4 connectivity - local & IPv6 connectivity -limited. This all started after we uninstalled Norton and tried to install Avast antivirus software. After installing Avast the computer shut down instead of rebooting. We had to do a system restore.

The PC in the other room is using windows '98 and is connected to the router with a cable and is working fine. Any ideas?When you uninstalled Norton, did you restart your computer, checked the control panel to make sure all instances of Norton were gone, and restarted again?

Make sure your firewall is on. Go to the Start Menu, type Firewall, and select "Windows Firewall" (not with Advanced Configuration)
Assure that it is on.

Then click Start, type cmd, and right click cmd and select "Run as Administrator"
Type the following in:

ipconfig /release

ipconfig /renew

Also, is this an Ad-Hock network?Tried what you said. Got the following.
"No operation can be performed on area connection 2 while it's media is disconnected" followed by "an eror occurred while renewing interface wireless network connection: unable to contact your DHCP server"

Any ideas?It sounds like you need to go into your Wireless configuration program in Windows and select your wireless network again... it must have been lost.

Where would I find the wireless configuration program? We tried searching on the start menu, and got no MATCH. Would it be Manage Wireless Networks in the network and sharing centre? We clicked on add wireless network and nothing happened.