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#11
I'd navigate throughout the BIOS and look at any setting that was related to IDE, SATA, AHCI, Legacy support etc and try to find a combination of settings that will get you past the error. Make note of what the current settings are so you can always return to the current setup.
There's probably a place or two in the BIOS related to that stuff and it might have an enable/disable switch or it might have several choices. You just have to experiment if you cannot find a bona fide Win 7 driver--which should be out there somewhere.