When you try to upgrade a Windows-based computer to Windows Vista from an earlier version of Windows, the upgrade process is unsuccessful for either hardware or software reasons. Then, the computer does not rollback to the original operating system. Additionally, the computer may restart continuously.
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This problem occurs because the rollback process does not initiate automatically after the upgrade process is unsuccessful.
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To resolve this problem, press the DOWN ARROW key, and then select the
Windows Setup Rollback entry from the menu options when the computer restarts.
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This article may mostly describe the Windows Vista installation problem for single-boot systems.
For more information about the unsuccessful installation of Windows Vista on dual-boot systems, click the following article number to view the article in the Microsoft Knowledge Base:
930132 (http://support.microsoft.com/kb/930132/)
The computer continuously restarts after you unsuccessfully try to install Windows Vista on a Windows-based computer
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