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A few things to try when getting a BSOD 0x7B on boot: this error apparently has to do with a chipset/storage issue. First try changing the SATA mode configuration in BIOS from IDE to AHCI or ATA.
Next you may need to rebuild the boot records. Boot from the Windows 7 install DVD. Load the up command prompt:
>bcdboot D:\windows >bootrec /fixboot >bootrec /fixmbr >bootrec /rebuildbcd
Finally. restart. You may also need to completely rebuild the boot records. Load up the command prompt again.
>bcdedit /export D:\BCD_BU >D: >cd boot >attrib bcd -s -h -r >ren D:\boot\bcd bcd.old >bootrec /rebuildbcd