Keep your SATA drives in IDE mode, boot up windows 7 and follow this tutorial:
http://www.ithinkdiff.com/how-to-ena...-installation/
This will enable Windows 7 to recognise your AHCI configuration, so after following that tutorial you can leave your SATA drives in ACHI mode.

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My Specs
System: Custom Built
Mobo: ASRock Z68 Extreme4 Gen3
OS:Mac OS X MountainLion 10.8.2 & Windows 7 Ultimate x64
CPU: Intel Core i7 2600k @ 4.2GHz
Memory: 16GB DDR3 XMS3 1600MHz
Graphics Card: AMD Radeon HD 6870 1GB

Email/Gtalk:
[email protected]