ITunes Library File Not Valid! What the Heck?

I have 11,500 songs in my music library and am running iTunes 7.0.2. My iTunes Library file from time-to-time becomes corrupted, on probably at least a weekly basis. I have no idea what's causing this.
Here's the typical scenario ... iTunes works fine, I quit it, and the next time I open it it shows the dialogue box that says, "Importing 'iTunes Libray.xml'..." Then it organizes the files and a dialogue box indicates "iTunes Library" does not appear to be a valid iTunes Library file ... Renamed damaged file ..."
When it's finally all done, I get my music library back minus all my playlists as well as EQ and volume settings.
This happened today and my most recent backup (done earlier in the day) was also corrupted. This is why I've learned to keep a set of four recent backups just to insure I have a reliable and useable one not more than a couple of days old. But it seems a very unnecessary hassle and I'm always losing adjustments made to my database!
Anyway ... would anyone among our distinquished and experienced iTunes geeks out there have a clue as to why this is happening OR any suggestions as to what I might do to help alleviate the problem?
Is anyone aware of a program that will search for corrupted files within your music library? I suspect this might be part of the problem.
Thanking you in advance for your help!
PowerBook G4 17" | 80GB Video iPod Mac OS X (10.4.5)

It seems like the ITL file is not being properly written after iTunes closes. Then when you re-open iTunes, it cannot load the ITL file and creates a new one. Forcing you to recreate your Library manually, again and again.
Several things to check:
-Double check to see that the ITL file or the folder it resides in is not read-only.
-Using Windows Explorer, right-click on the file (or folder) name, go to Properties.
-If it is, then close iTunes, change it, and reopen iTunes.
See this thread to reset the iTunes preferences: http://discussions.apple.com/message.jspa?messageID=1216090#1216090
And see this post to use TweakUI to check the location and validity of your My Music 'Special Folder': http://discussions.apple.com/click.jspa?searchID=487067&messageID=1197027
Once the main cause of the inability to save the ITL file is corrected, you'll need to recreate your Library one last time to finally save it. No way to resurrect the original one, unless you had backup copies of the ITL file.

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ITunes Library.itl not valid music library file

"iTunes Library.itl not valid music library file" I get this error almost everytime I restart my computer. When itunes makes the new ".itl" file, not all of my music is listed in the library. I have read through a large amount of the forum posts on this topic and have not found a solution that works for me yet.
How can I stop iTunes from doing this everytime I restart my computer?
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It seems like the ITL file is not being properly written after iTunes closes. Then when you re-open iTunes, it cannot load the ITL file and creates a new one. Forcing you to recreate your Library manually, again and again.
Several things to check:
-Double check to see that the ITL file or the folder it resides in is not read-only.
-Using Windows Explorer, right-click on the file (or folder) name, go to Properties.
-If it is, then close iTunes, change it, and reopen iTunes.
See this thread to reset the iTunes preferences: http://discussions.apple.com/message.jspa?messageID=1216090#1216090
And see this post to use TweakUI to check the location and validity of your My Music 'Special Folder': http://discussions.apple.com/click.jspa?searchID=487067&messageID=1197027
Once the main cause of the inability to save the ITL file is corrected, you'll need to recreate your Library one last time to finally save it. No way to resurrect the original one, unless you had backup copies of the ITL file.

HT1660 the itunes library file cannot be saved.The disk you are attempting to use is full. What do i do?

the itunes library file cannot be saved.
the disk you are attempting to use is full.
What do I do?

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ITunes Library is not valid?? Someone please help!

My computer froze up last night and I had to restart it. Just now I tried to open up iTunes since it froze last night and now I got a popup that says my iTunes Library is not valid and that it needs to create a new one that says "iTunes Library (Damaged)".
When iTunes opened up none of my songs were there and neither were any of my playlists. It's as if I am using iTunes again for the first time and I have no songs or anything.
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Did you try a permissions repair using your old library file? That may solve the problem without a lot of trouble.
You can re-import all of your song files back into iTunes, but you will lose all your settings and playlists. I would do that only as a last resort.
You can find out which files are different between the backup and main Music folders. If you have the OS X Developer Tools installed you can use the "File Merge" utility to compare the two folders. It can be found in Developer/Applications/Utilities. It can tell you what files are identical, unique to one folder or the other, and files that have been added or deleted to either. Depending on how big the folders are it can take a very long time to run the comparison. You might want to run it when you are not using the computer, like overnight.
After you find out which files are different in the newer Music Folder you can then just re-import them only without affecting things since the last backup.
Also, iTunes will use whatever library file was last used until you change it by holding down the option key add selecting a new one when you start iTunes. So any files that are added will be added to the current library file in use.
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http://support.apple.com/kb/ht1353
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Hi,
Has anybody else been having trouble since installing the latest update to iTunes?
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Hi,
Has anybody else been having trouble since installing
the latest update to iTunes?
I have iTunes version 7.3.0.54
And I keep getting the below message:
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Anybody got any ideas?
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It seems like the ITL file is not being properly written after iTunes closes. Then when you re-open iTunes, it cannot load the ITL file and creates a new one. Forcing you to recreate your Library manually, again and again.
Several things to check:
-Double check to see that the ITL file or the folder it resides in is not read-only.
-Using Windows Explorer, right-click on the file (or folder) name, go to Properties.
-If it is, then close iTunes, change it, and reopen iTunes.
See this thread to reset the iTunes preferences: http://discussions.apple.com/message.jspa?messageID=1216090#1216090
And see this post to use TweakUI to check the location and validity of your My Music 'Special Folder': http://discussions.apple.com/click.jspa?searchID=487067&messageID=1197027
Once the main cause of the inability to save the ITL file is corrected, you'll need to recreate your Library one last time to finally save it. No way to resurrect the original one, unless you had backup copies of the ITL file.

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+The only files it can play are four songs that were imported before a massive rebuild of the library occurred the next day!+
This is probably a big clue, but I don't understand what you mean by it!

ITunes Library File Not Valid! What the Heck?

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