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I've just tried upgrading Windows 7 to Windows 8 CP on my macbook air and after it restarted, I've repaired my MacDrive installation which claimed that it had problems.

Since that I keep getting BSoDs on boot and I can't even boot in the recovery environment or in safe mode. Is there any way I can make it from within Lion so that Windows won't try to load MacDrive's disk driver? (I have writing access to my windows partition, so editing files won't be a problem)

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Try to find the macdrive.sys file on your Windows partition (probably in system32), and try moving it/renaming it. That should (ham-fistedly, but effectively) remove the driver from Windows' load order.

Try searching different case combinations, like Macdrive.sys or MacDrive.sys if you can't find it, since OSX is a case-sensitive OS.

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I've removed MDFSYSNT.SYS and MDPMGRNT.SYS (the two MacDrive-related drivers) and I still get the same INACCESSIBLE_BOOT_DEVICE blue screen... – em70 Mar 7 '12 at 8:19
    
Then I'm not sure this is MacDrive related. Try running the startup repair tools off of the windows 7 installer disk. – Zac B Mar 8 '12 at 21:08

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