New 7.5 Unknown Error (-1450)

Hi everyone. After installing the new version (7.5) this error message appeared- Itunes library cannot be saved unknown error (-1450) and deleted my library. Although it was backed up. So I uninstalled and reinstalled everything and still the same thing happened. Anyone have any ideas????? Or where i can download the old version from that would be great. Thank you.

Look man, I've had a personal experience with this error myself, and I know how frustrating this is. I have found a very probable solution, so this is my post from another thread that should hopefully solve your problem. It has nothing to do with your upgrade to itunes 7.5. Believe me, I know first hand what this error does. Here it is....
"I may have found a solution for some of you and possibly me for this problem. I found this article while searching google and it seemed to make perfect sense. It's an issue with memory or virtual memory. Cuz this "error" seemed to appear after I had nearly 2000 songs in my library. I don't think it had enough memory to save the library because it was way to big.
Here's the article: http://sonnoprofondo.net/tech/2006/41 I'm pretty that's the only problem causing this error. Good luck!"
Let me know if this was your solution. I just know first hand what this is entails and how I've spent many nights trying to get rid of it. Now, I'm trying to help anyone I can because I don't want other people to go through what I had to. Best of luck!!!
Here's a thread that may also be of help from this forum.
http://discussions.apple.com/message.jspa?messageID=5914750#5914750

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