Vista - help - cannot connect to new networks

Need help
I can no longer "Connect to Network" or "Set up new network".
Current wi-fi connect at home works fine - as this was already set up.
Can't use wireless except for the saved connections.
I have tried uninstalling/reinstalling the wireless lan driver.
I have tried turning off the firewall.
Diagnose and repair network shows no errors.

I did get a blue screen one day and had to reboot, so that could have caused something to go wacko, but I have no idea what caused it or what it could have corrupted.

does anyone have any suggestions on how to find what is causing this?
Any help would be greatly appreciated.