Sony Vaio VPCE3M1E Actually to say that, 'New Vaio Won't allow second operating system.' is an understatement, I even went as far as buying a new Sata drive today so that I could install any operating system from scratch. This is what happens: Irrespective of how I go about it either with a new partition on the original drive or on the drive I bough today the same thing happens, The new installation commences as per normal with the various drivers being loaded. Eventually the installation process arrives at the point where it says, 'Starting Windows' and this is the point at which the computer stops with the following message: A problem has been detected and windows has been shut down to prevent damage to your computer. If this is your first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps: Check for viruses on your computer. Remove any newly installed hard drives or hard drive controllers. Check your hard drive to make sure it is properly configured and terminated. Run CHKDSK /F to check for hard drive corruption, and then restart your computer. Technical informsion: *** STOP: 0x00000007B (0xF78D2524,0xC0000034,0x00000000,0x00000000) Since the stop code signifies: INACCESSIBLE_BOOT_DEVICE I thought it might be something to do with the Sata set-up in BIOS but there is nothing that's alterable. The BIOS is: American Megatrends Version R1140Y8 ME Version 220.127.116.118 At this point I'm lost - any thoughts?