Failed to save library - an Unknown Error Occurred

I have iTunes 10.7.0.24 running on a Windows 7 64bit (Dual 3.07Ghz 2GB RAM) VM. My library has 18,376 songs, 636 movies, 2,328 TV Shows, and 194 apps. iTunes is providing content to 3 Apple TV's, 3 iPhones, 1 iPad, and 1 iPod.  Occasionally(several times a year), when adding or deleting content I see the message 'Failed to Save Library - an unknown error has occurred'.  When this happens the iTunes process is generally using around 400-500MB of memory. The system always has at least 1GB of available memory (above that being used by the system and iTunes). The computer does nothing else except run iTunes.  If I restart iTunes memory consumption drops to around 120MB. So far I have not found any errors (i.e. files I added are there and files I deleted are gone).. I currently have 933GB of free space on the disk storing the files and library. There are no backup processes running on the PC (Backups are timed to occur at night when the system is idle and are processed by a server that hosts the iTunes Media disk). I am using Microsoft Security Essentials on the PC. The network connection between the iTunes PC and Server hosting the media disk is 10GB (sic).
Does anyone else see this error or know what could be causing it?  My current thinking is the problem is updating the library XML file (currently just over 33MB).

Use the Rebuild command. (In early versions of Library Manager it's the File -> Rebuild command. In later versions it's under the Library menu.)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.

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