iTunes, iPhone and Syncing to a new computer.....

If you have iTunes and wish to rebuild you OS (Operating System) then when you install iTunes you will get issues with your iPhone sync as all your data will be synced with "another computer"....when I came across this problem I noticed that all the solutions pointed to the iTunes Music Library.xml (not the iTunes Library.ibl) which is located in on the following locations:
Windows Vista : "C:UsersMusiciTunes"
Windows 2000/XP : "C:Document and SettingsDocumentsMy MusiciTunes"
If you edit the iTunes Music Library.xml it will look a little like this:

<?xml version="1.0" encoding="UTF-8"?>

<list version="1.0">
<ict>
        <key>Major Version</key><integer>1</integer>
        <key>Minor Version</key><integer>1</integer>
        <key>Application Version</key><string>7.7.1</string>
        <key>Features</key><integer>5</integer>
        <key>Show Content Ratings</key><true/>
        <key>Music Folder</key><string>file://localhost/C:/Users/Artic6/Music/iTunes/iTunes%20Music/</string>
        <key>Library Persistent ID</key><string>A782FADD5FD5E85C</string>
        <key>Tracks</key>
        <ict>
                <key>281</key>
 

It seems that each computer has a persistent ID which is extracted from the XML above....
Library Persistent IDA782FADD5FD5E85C
You need to get your old computers Persistant ID and override this one so that iTunes thinks this is your old computer...so the internet says but that I not what I advise you to do.....
WARNING : Ensure iTunes is NOT loaded before you start this tutorial.....
1. Navigate to the folder where you iTunes (in the Music folder in My Documents) backup is located.
2. Enter the foler named iTunes
3. Highlight all the files in the location......
4. Right click and choose "Copy"
5. Navigate to the correct location based on your OS:
Windows Vista : "C:UsersMusiciTunes"
Windows 2000/XP : "C:Document and SettingsDocumentsMy MusiciTunes"
6. Right click in this folder (which will have files in it)
7. Choose Paste
8. Ensure you override all files in the location
9. Launch iTunes and perform a Sync as normal