After installing the rebel efi and setting up Snow Leopard properly, I cannot boot into windows through the boot selection. Selecting windows results in Grub loading : error 22 and booting into any of the other drives did not work. I also tried returning the BIOS settings to before Snow Leopard was intalled. Which seems to result in the same error. The other problem is that the sound card does not seem to work in windows. although it states that 82801JI (ICH10 Family) HD Audio Controller works. There is no input or output sound device The thing is that I have already successfully installed Snow Leopard on a drive. Here is the setup. The system has 3 Hard Drives 1. Windows 7 x64 Installed 2. NTFS Hard drive for storage 3. Snow Leopard drive with single partition. It currently only boots into the Snow Leopard. Whereas it shows a Grub Loading error 22 if you try to boot into windows. I would really like to dual boot windows 7 and Snow leopard.. or atleast be able to use my windows 7 which does have "sound" And for the sound card issue, the sound card is the built in sound card of the Gigabyte EP45-UD3L motherboard. And this is the answer from Psystar which didn't help me much: The Snow Leopard hard drive needs to be set as the primary boot device. Upon start up DUBL should recognize this, and all other attached drives. In regards to your sound related issues Psystar is working to make as many devices as possible compatible with Rebel EFI.New hardware profiles are continuously being added. Be sure to have the latest version of Rebel EFI downloaded and installed for maximum compatibility. This can be done simply by launching the application and updating when prompted. Psystar is working to make as many devices as possible compatible with Rebel EFI. If you would like to have your device tested for compatibility, fill out a device compatibility request (DCR) form. For more information on sending in your device for testing, or for a DCR form, contact firstname.lastname@example.org. Could someone please help?