I wanted to use a Intel Rapid Storage controller in "RAID" mode, but Windows 7 didn't like me changing that option and refused to boot, just showing me a very generic bsod.
After quite some time I found a solution:
First start from the installer disc and go to recovery options, open a command prompt.
Look for the system drive, on my system it was just drive C, so typing
c: changed the current directory to the base directory on that drive.
Next load the registry:
reg load HKLM\TempSys C:\Windows\System32\SYSTEM
Now you can run
regedit.exe, go to
HKEY_LOCAL_MACHINE\TempSys, and look in the control sets in there for
iaStorV directories change the option
After modifying the registry you need to unload it:
reg unload HKLM\TempSys
Reboot and just hope it works.