I'm using a IBM Thinkpad T42p laptop which was originally running Windows XP. My friend gave me bootable Windows 7 USB stick which he had used to successfully install Windows 7 on his laptop which is the same as mines (we're using school laptops) whenever I run the setup the laptop always abruptly restarts during the "Completing Installation" process and I get an error message saying "The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install Windows, click "OK" to restart the computer, and then restart the installation." then it just restarts and loops the message.