Don't install Beta MS AntiSpyware product on your Windows Media Center PC if you have an Extender

Just a note in case someone else is struggling with this. All of a sudden my extender stopped connecting to my Media Center PC last night for no apparent reason. Something about a 00020002 error. After troubleshooting it for a while I finally noticed from the event log that the conflict was with the Beta Microsoft Windows AntiSpyware application I had installed the day before. I removed the AntiSpyware product and it started working again.

This Extender discussion forum on thegreenbutton looks like it may be handy to read from time to time. Someone else was having the same problem and apparently has already contacted Microsoft about it.