bios are copyrighted files. thats why they have been removed on some sites. I konw for a fact that there are still some sights that have ps1 bios that you can download since I got mine last week online. However, it is against the forum rules to tell you which sites. All we can say is google it and you will eventually find it.
You can find emulator plugins on the emulator zone site (not these forums but the actual host sight). The plugins depend on the hardware you have on your computer (video card, sound card, etc.)
also you should not bump your thread. There is an edit button to edit your post. (however, it will dissappear after an hour i think) Bumping threads often will get you banned as stated in the rules:
http://forums.emulator-zone.com/rules.php?