10.4.4 upgrade -- completly messed up my wireless network

I have a wireless network--my main base station is an airport extreme, and I have extended the network with an express (to play my music) and another airport extreme to extend the network for the use of my tenants. It worked great until yesterday, when i upgraded to 10.4.4. I cannot stay connected with my main base station. after much start and restart, it shows, then loses it. My express always shows up, and the second airport sometimes. It's a mess and I wish I had not upgraded. Is there any way to downgrade?

You can't downgrade easily unless you made a backup prior to your upgrade. My suggestion is to isolate what is causing your wireless networking issues. As I found out, creating a new location in the Network System Preferences helped isolate my wireless issues. Here's the thread where I solved that issue, and maybe my method pertains to yours:
http://discussions.apple.com/thread.jspa?threadID=313041&tstart=0
In addition ensure both the base station firmware and Airport software are up to date:
http://www.apple.com/support/downloads/airportextremefirmwareupdate57formacosx.h tml
http://www.apple.com/support/downloads/airportexpressfirmwareupdate63formacosx.h tml
Use the About Airport Window (from the Airport menu) in the Airport Admin Utility to verify you don't need this update:
http://www.apple.com/support/downloads/airportupdate2005001.html

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