IBook acting erratically - help!

My iBook has recently started to act really strangely. Usually, I am typing a Word document or using Safari when this happens: the screen dims until black, the windows go away (like pressing f11), and "1qaz1qa" is typed repeatedly into any sort of text area I am using. This happens in what I would call "fits," during which I can barely use it. Also, when I am using Safari, it's like I pressed the back button, so I have to re-navigate to the page I was viewing.
This problem is really annoying and I can't really use my iBook when it happens (very often). I recently got rid of the w97 virus using VirusScan. Does anyone know the cause of the erratic behavior? thank you!

see this thread:
http://discussions.apple.com/thread.jspa?threadID=1525869&tstart=60

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Okay I have an Apple PowerBook G4 running Mac OS 10.3.9 Panther (purchased late Nov 2003 was originally running 10.2.8 Jaguar) and up till a few days ago everything was running smoothly. That is until after I upgraded to QuickTime 7.1.2 and installed iTunes 6.0.5 when the problem started. Somehow my login.keychain for Safari got corrupted and I tried deleting original and making a new one.
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Since day before yesterday 4 times when I open iTunes it tells me my Library has been damaged. All my music files are still on my hard drive and are still playable but my iTunes Library file is corrupted -- how and why I don't know.
No music appears in my Library nor do any of my videos in .m4v format (iPod format) show up in my Library since then. I trash damaged file and re-import or select add to library and re-add all the media to my Library seems to work fine. I play them and most of them are playable. Even when Library works a few that played earlier have a skipping problem.
In Safari all my bookmarks got deleted -- I had to back, find the websites and re-add them -- fortunately when I closed Safari and re-launched the browser they remained saved the next time I closed and re-started the browser. However, third time (normally when something doesn't work twice they say third time's the charm) well the third time I opened Safari everything got deleted again.
My iTunes Library is acting erratically -- files I download don't work although files I already have are still playable usually except when my programs run across errors that didn't exist earlier.
I have Microsoft Office X 10.1.6 with the PowerPoint X and Excel X Security Updates, the Apple Security Updates 2006-002, 2006-003 and QuickTime 7.1.2 and iTunes 6.0.5.
When I originally downloaded and installed Security Update 2006-001 my Safari completely broke and would stop running and my Dock Menu dissappeared until restart but even then Safari stopped working. Could find no other solution than reinstalling OS X to return my Mac to pre Security Update 2006-001 levels. Not even Disk Utility solved the problem.
iTunes 6.0.2 also caused problems for me (I heard it caused problems on Windows also) the problem on my Mac was Disk Utility stopped working altogether. Fortunately, by deleting the game Chess from my Mac it fixed the problem. Today, I have Chess back on my computer because since my last OS reinstall I just updated my iTunes to 6.0.3 (I think) I now have iTunes 6.0.5 and have had no problems with Chess and iTunes or iTunes and another application like Chess preventing Disk Utility from working -- but now this problem I am describing where my Library erases itself regularly -- sometimes I restart iTunes and the new user wizard shows up and asks if I want iTunes to find my media and automatically add it to my Library when it does I say yes and it re-adds everything but somehow I have 2 files for every song on my computer and it re-imports (or imports) all my music, videos and podcasts back into my Library once and then re-imporitng it again
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Fortunately, I had burned the video to a CD so I can re-copy it to my Mac and when I play it off the CD on my Mac or copy directly to Mac and play it works just fine.
Since downloading these updates cannot download anything anymore without errors when playing them.
If I downloaded same files earlier though they would have worked.
Only as a last resort would I do a clean reinstall of OS X -- thing is it would take a lot of work just to reinstall OS X, copy all my files I have backed up back to my hard drive, re-importing my music and artwork, re-installing Microsoft Office X and its updates, reinstalling some (but not all the latest ones if neccessary) of Apple's Security Updates, reupdating to Mac OS 10.3.9 to reinstall QuickTime 7.
I had like 283 files in my iTunes Library, including all my music, videos, podcasts etc.
Imagine how long it would take to get them all back in there; and I re-did it last night until it got erased again. Don't want to re-do it unless next time it stays permanently.
Just a note I also have Virex 7 on my Mac -- and it used to be a startup item but somehow it got disabled from starting up.
Also, I do have VLC Media Player but even that has been having problems with playing newly downloaded media files since I updated my QuickTime.
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Also the problem involves my Safari erasing bookmarks on its own as described above. Please help anyway you can!
As a last resort will do a clean reinstall, re-copy all my files back to my hard drive, reinstall my programs, re-update my Mac carefully etc.

Thanks for the help. I will take your advice and try running Disk Utility again. I have noticed sometimes when running Safari after quitting the application my defaults get changed -- that is my preferences go away. I have popup blocking and tabbed browing normally enabled by default it used to be if I enabled them as long as I didn't manually disable them that they would stay the same even after I quit and relaunch the browser, but now they get disabled when I quit and have to manually re-enable them again.
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I recently posted a thread conserning Flash CS3 deleting the
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Were you able to use the Disk Utility in your PowerBook in 10.4.7, to see
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IBook acting erratically - help!

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