It returns your system to previous installation of the operating system, Microsoft Windows XP in this particular case. In this process, the hard drive structure, file system, and partitions remain unchanged. It prevents the file loss situations and needs File Recovery solutions.

When you encounter any error during Windows Vista upgrade process, rollback can be either successful or unsuccessful. In case of unsuccessful rollback process, the system may return to working state. You may come across any of the below symptoms if rollback is unsuccessful:

* The system does not boot up, or you get an error while trying to boot the system.
* You receive “Rollback Setup” message each time when you boot the system.
* When you attempt to start previous Windows installation, the below error occurs:

“Windows could not start because the following file is missing or corrupt: File name”

The above symptoms may take place in any of the below conditions are true:

* The boot sector on Windows hard drive is still using Bootmgr (Windows Boot Manager) in place of NTLDR (Windows NT Loader).
* Rollback data for Windows installation is either inaccessible or corrupted.
* Rollback phase is incomplete or aborted.

Troubleshoot Unsuccessful Rollback

In order to sort out the unsuccessful rollback, you must first preserve your valuable data files on Windows hard drive. After that, prepare your system so that the operating system can be reinstalled. For this, use any of the below methods:

* Restore boot sector of your Microsoft Windows computer.
* Install Microsoft Windows Vista to a new folder.
* Install Microsoft Windows XP to a new folder.
* Use command prompt in Microsoft Windows Recovery Environment. It is the quickest method to fix this issue.

However, if the above methods cannot help you to recover lost data, File Recovery is the only way to go.

You can easily recover your lost files with the help of powerful and advanced File Recovery Software. The applications are particularly designed to carry out in-depth scan of affected Windows hard drive and retrieve all lost, missing, and inaccessible files.

Stellar Phoenix Windows Data Recovery is the most excellent solution for recovering all types of lost Windows files. The software is designed for Microsoft Windows 7, Vista, 2003, XP, and 2000. It supports File Recovery from FAT16, FAT32, VFAT, NTFS, and NTFS5 file system partitions.