'Famous' blue screen at startup AND safe mode boot failure

Dear all,
Two days ago, after installing the new Java update/airport update and restarting, I encountered a 'blue screen' on startup after getting past the mac symbol and swirling cog. I cannot say whether the updates were the cause (doubtful) of if my cheap USB mouse that was still plugged it caused it or whether i have the dreaded 'bad sectors.' The cause aside, here is what i've tried to fix the issue:
1) Disk Utility - Verification (OK'd) and Repairs (fine)
2) Disk Utility - Verification of Permissions (a few needed to be done) All repaired
-blue screen-
-Restart after period-
3) Rebooting in safe mode, removing startup items from the login items settings menu
4) Removing startup items from System/Library/StartupItems folders
5) Remove airport extensions (recent - date modified in list view)
(NB - safe mode i could say my desktop perfectl in original form and all files!)
-Restart-
-no longer able to start in safe mode-
-blue screen remains-
6)Single User mode -
resetting preference files (loginwindow.plist and windowserver.plist)
Finally system profiler from Tiger DVD states:
*Permissions repaired
*Dependency errors: com.apple.iokit.IOUSBFamily & com.apple.kernel.iokit no valid version found
*Integrity: kext has no receipt
I backed up most my data from the LAST crash, but recent music/1000 photos and others have been backed up altho i've been meaning to! Help!
I'M PANICKING now can no longer get in SAFE MODE!!
Please help Mac911!!!!
Charlie
G3 iBook 800mhz   Mac OS X (10.4.6)  

Update:
So, I managed to do ALL that you said, EXCEPT, the reboot and work fine business.
I created the admin account which works fine. So now I can see three user accounts (looks like there as already an admin type one).
The one I created works fine, only, I can only access/see the login screen through a safe boot, (otherwise blue screens...) . I can get into the admin account fine, but when restarting and logging in as my original user account it won't boot. Something is very wrong in MY user account. I think at this point my data there is still retrievable somehow for a backup, clean start. but i haven't reached that point yet.
Anyone have any clues what migt have caused the error in my user login?
One of the things I tried (too hastily now i admit) first was to remove the recently added updates from the extensions folder. has this exacerbated the problem? Can i put them back without logging in as me??
remember from my first post system profiler says software/extensions integrity 'kext has no receipt' and dependency errors: 'com.apple.iokit.IOUSBFamily and com.apple.kernel.iokit; no valid version found' - whereas in my newly created admin account it appears AOK.
is this the source?
any ideas anyone?
sorry lots of queries here but i am ever hopeful.....
All yours,
Charlie
G3 iBook 800mhz   Mac OS X (10.4.6)  

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