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I have installed Windows 7 on drive which was in IDE mode. When I have changed mode to AHCI OS didn't start (I know. AHCI drivers are needed.). Unfortunately when I back to IDE mode, OS still won't start. Computer starts, Windows loading logo apears, but after few seconds it reboots. Probably my OS is corrupted. I tried to use recovery drive, but it didn't find any problems. Fixing MBR also didn't resolve my problem.

Have you got any suggestions?

Thanks in advance.

Pawel

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You will need to reinstall the operating system and/or use the recovery console. –  Ramhound Oct 22 '12 at 19:41
    
Possible dup of superuser.com/questions/225189/…. However, I found that it is much easier just to 1) uninstall the current driver, 2) reboot, 3) force install the other version of the driver using the "Have disk" option and 4) reboot to BIOS and change the option. This works 100% of the time with Intel controllers. Even if you missed a reboot, you can always just switch the mode back in BIOS and try again. –  billc.cn Oct 22 '12 at 19:50
    
Can you boot into Safe Mode? –  Moab Oct 22 '12 at 20:35
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