Error message -50 ever since I installed new version of iTunes... weird!

A few days ago I installed the new/updated version of iTunes from the 'automatic prompt' which informed me there was a newer version of the software available.
Now, ever since I've been using iTunes upon start-up I get this weird thing happening:
1- ITunes opens, no problem
2- Progress bar appears on screen saying "Updating iTunes library" (which never happened before I installed the new version on iTunes)
3- An Error message appears saying "the iTunes Library files cannot be saved. An unknown error occurred (-50). Do not warn me again"
Well, my iPod seems to be sync-ing fine and I've not lost any music, so I'm confused as to what this error message actually means.
If anyone can shed any light on this or what I've done wrong I would be most grateful.
I don't fancy losing all my podcasts and music! Ouch...
Thanks!
MacBook Pro video iPod 80GB

I would check macfixit.com . there are several articles about fixing the -50 error. The latest article is free, the others require a subscription. This is from their very helpful site:
Another option for recreating the library to resolve -50 errors We previously reported that a full library deletion and restore may be required to eliminate -50 errors that occur while iTunes 7.3 is launching. The process we mentioned involves backing up the music library to another location, then deleting the original library and finally re-importing. However, you can also simply backup then create a new library at launch and re-import, as follows:
1. Quit iTunes
2. Backup your iTunes library (the folder ~/Music/iTunes) to a separate location (can be on the same volume)
3. Launch iTunes while holding down the option key and follow the steps to create a new library
4. In iTunes, choose Import from the FIle menu
5. Select the backed up ~/Music/iTunes as a source folder
6. Restore any deleted preferences
<<<br>
G5 1.6 Mac OS X (10.4.10)

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Error message -50 ever since I installed new version of iTunes... weird!

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