Moving Existing Windows 7 Pro 64Bit OS Install To RAID 5?

I have the following MOBO:

ASUS P7P55D-E EVO
2X80gb Western Digital SATA Drives
2x2TB Samsung Spintpoint SATA Drives

I have already been using the machine with another 80Gb Western Digital SATA Drive with Windows 7 Pro 64Bit installed and now want to convert to RAID 5 for redunancy in case of Drive failure (We all say we will back up but we are all lazy when it comes to it LOL).I have taken out the original OS drive and plugged it into the E-SATA connector on the MOBO, gone into the BIOS, turned on RAID for the SATA Ports on the MOBO, and connected the 2 X 80Gb Boot drives. Entered the Hardware RAID Controller POST, and created the RAID 5 Volume from the 2 X 80Gb Discs.Now boot with Acronis Wester Digital edition.Clone the Original 80Gb Disc to the new Raid Array.Shut machine off, remove original OS 80gb Disc from E-SATA port.Boot machine.It starts to boot, and gets as far as the Windwos 7 Microsoft 4 Colour logo and then I get an error and then have to boot into Windows 7 from DVD and go through the repair process.When the Repair has run it reports the following:

The following startup option will be repaired:

Name: Windows Boot Manager
Identifier: {9DEA862C-5CDD-4E70-ACC1-F32B344D4795}

The following startup options will be added:

Name: Windows Recovery Environment (recovered)
Path: Recoverye52d0bc2-1f15-11df-af10-d764fe3715b8Winre.wim
Windows Device: Partition=D76190 MB)

A copy of the current boot configuration data will be saved as:C:BootBCD.Backup.0001 However it fails to do the update How do I get this RAID to boot successfully? I *don't* want to have to re-install the Operating System as that is just too painful a thought?