I'm pretty sure your problem lies in how you installed Ryan's hotfixes, how you installed your applications, and how you went about making the unattended cd. That's why I recommended asking this question in the unattended board instead of here, because your install is now heavily modified. Since you did a bunch of things and actually tried the install without doing a test install in a virtual machine, there's no way to tell what caused your problem. However, I don't think your MBR has anything to do with it. Why not follow the Unattended CD Guide and try again? Install a virtual machine, and then recreate your iso and do a test install. Do one thing at a time - get the unattended basic install working, then add the ryan pack and test it, then add your applications and test again. The only thing you can't test is your drivers - that requires an actual test box.