As the Windows upgrade process backs up your data to the backup C:\Windows.old folder, we can use that folder to restore your data.
It just means that the Windows setup program had a problem transferring it over or you specified not to. If your personal document folders are empty after an upgrade that does not mean that your data is lost. These reasons may include permission issues on the files or folders or because you selected the Keep Nothing option when you upgraded to the newer version of Windows. When you upgrade to Windows 8 there may be situations where your personal documents are not transferred to the new version of Windows.
