Reinstalling Windows may not be necessary. You can try to rewrite the MBR on your Windows HD. Boot with your Windows 7 installation DVD and select repair. Unplug your OS X drive first!
If that doesn't work, there are other ways to rebuild the MBR - with Testdisk for example:
http://www.cgsecurity.org/wiki/TestDiskI have the intention of reinstalling windows later on the first disk but I hope that it won't mess up my OSX MBR....
Just unplug your OS X drive before installing then.
My OSX partition is on the second disk drive / EFI disk1s1
Look again. disk1s1 is the "EFI" partition, it is not your OS X partition. Your OS X system partition is
disk1s2. It is VERY important that you understand how to read the output from
diskutil list. Otherwise you will end up hosing your installation again.
zip and attach your /Extra/com.apple.Boot.plist and /Extra/smbios.plist.
From a quick look at your bdmesg, you're using HDAEnabler and VoodooHDA at the same time. This can be bad. HDAEnabler is designed to work with the AppleHDA driver that ships with OS X, VoodooHDA is a stand-alone 3rd party driver. Never use both at once, this can cause conflicts and in the worst case prevent your OS X installation from booting.