About 3 weeks ago, the wireless connection to one of our machines stopped
working.  It had been working fine for over a year and nothing was changed
in the network.   We were usinig WPA so in an effort to troubleshoot, we
dropped back to no security and it connected.  When we try to re-enable WPA
or use WEP though, the machine is unable to connect.

I looked at the Windows Update log and noticed  that there were some OS
security patches downloaded around the time things went bad.  Are there any
known issues is this area?

Thanks.