ITunes Library Loses All Content

* APPLE SUPPORT PLEASE HELP *
I have an intermittent problem wherby all content is lost from the iTunes library (Music, Films, TV, Books, Apps).
It may be caused by syncing to my new iPad (I also sync iTunes with my 2nd Gen iPod Touch). The iTunes Library.itl file either gets deleted or corrupted.
I've tried backing up the files found in the c:\Users\username\My Music\iTunes folder (see list of files attached).
Restoring these files fixes the problem but I don't want to have to remember to backup these files everytime I purchase an App or import music into iTunes.
I have copies of various backups of the iTunes library files if that would help.
Volume in drive C is Vaio System
Volume Serial Number is 8635-22CC
Directory of C:\Users\Gary\Music\iTunes
21/02/2011 14:57 <DIR> .
21/02/2011 14:57 <DIR> ..
11/07/2010 20:48 <DIR> Album Artwork
21/02/2011 12:58 587,591 iT 1.tmp
21/02/2011 14:02 587,591 iT 2.tmp
21/02/2011 14:07 587,591 iT 3.tmp
21/02/2011 14:08 126,800 iT 4.tmp
21/02/2011 14:25 126,344 iT 5.tmp
21/02/2011 14:26 587,591 iT 6.tmp
21/02/2011 12:55 126,295 iT.tmp
21/02/2011 14:57 12,288 iTunes Library Extras.itdb
21/02/2011 10:56 32,768 iTunes Library Genius.itdb
21/02/2011 14:57 131,205 iTunes Library.itl
21/02/2011 14:03 <DIR> iTunes Media
21/02/2011 14:57 587,592 iTunes Music Library.xml
27/11/2010 22:21 <DIR> Previous iTunes Libraries
21/02/2011 14:08 587,591 Temp File 1.tmp
21/02/2011 14:09 587,319 Temp File 2.tmp
21/02/2011 14:46 587,320 Temp File 3.tmp
21/02/2011 13:59 587,319 Temp File.tmp
15 File(s) 5,843,205 bytes
5 Dir(s) 352,352,538,112 bytes free

There is a problem with media management software Vaio xml library Manager, the Vaio content manager and the Vaio Music Box software
http://discussions.apple.com/message.jspa?messageID=8537277#8537277
Work around:
In Control Panel, turn off Vaio Content Folder Watcher and VAIO Content Metadata Intelligent Analyzing Manager.
Also see:
http://support.apple.com/kb/ts2715
Sony has issued upgrades for some models, check you Sony download site to see if there is one available.

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