OS windows 7 ultimate 32bit CPU DualCore Intel E6300, 1866 MHz (7 x 267) Motherboard Asus P5LD2 Memory 2558MB Graphics Card ATI Radeon X550 (RV370) 3D Accelerator Monitor(s) Displays EnVision G218a1
Check also that you have the latest BIOS version update, and set the SATA controller in BIOS setup to AHCI first, then IDE if necessary.
None of the above worked for me, what I did was re-install Vista, formatted,
then ran the update from there after needing SP1 from the compatibility report and all is good now
OS windows 7 ultimate 32bit CPU DualCore Intel E6300, 1866 MHz (7 x 267) Motherboard Asus P5LD2 Memory 2558MB Graphics Card ATI Radeon X550 (RV370) 3D Accelerator Monitor(s) Displays EnVision G218a1