No network after 10.4.9 update

After update my home network became 10x slower. And today it doesn't work anymore. I've reinstall router settings and renewed all network settings on both,Mac and PC. No result. When I try to connect,it does pop up window with shared PC folder and icon in Finder,that's all. Than everything stuck with color ball forever.
I need to force to quit Finder and it doesn't want to relaunch,unless I restart MB.
No problems with wireless or ethernet Internet connection on Mac and PC.
Have now idea what to do...

David,
When you said that you had 'strange and unpredictable bluetooth issues'... do you mind me asking what they were? I seem to be having a problem when I try and link my cell phone to my PowerBook. The bluetooth starts acting weird and will not even recognize an Apple internal bluetooth module is even present within the PowerBook, my Apple will not go to sleep for more than a second, and my trackpad is behaving very erratically.
Does any of this sound familiar to you at all with your problems experienced???
In response to the terminal command that you listed to kill the bluetooth and remove the .plist file from the library, my PowerBook is not allowing me to do this, as after I type the 'sudo killall blued' command into terminal, I am receiving a response that is informing me that no bluetooth module is present within the laptop. The exact response is: 'no matching processes were found'.
Please let me know if you have an answer that may sort out my problem.
Thank you.
Regards,
Kieran
If you have problems in future, I found this worked for me when I had strange and unpredictable Bluetooth issues.
From terminal, type:
sudo killall blued
sudo rm -f /private/var/root/Library/Preferences/blued.plist
...and then immediately reboot.
This stops the Bluetooth daemon and removes the preferences. When the computer restarts it recreates the preferences. I had a persistent BT problem which this got rid of.
Aluminium PowerBook G4 15.4" Mac OS X (10.4.9) 1.67GHz - 1GB RAM - 128MB VRAM

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