I’ll try to gather here basic information to help us troubleshoot a lab issue.
MS support article: http://support.microsoft.com/kb/870702
A tool to measure signal strength: http://www.netstumbler.com/downloads/ – (does not seem to work)
http://www.passmark.com/products/wirelessmonitor.htm – to try
http://www.metageek.net/products/inssider/ – Open source, will try.
http://wlanbook.com/netstumbler-alternatives/ (great, shows the netsh usage).