Dynamic disk and Mirrors

I recently installed Windows 7 (32 bit on x 64 system) with 2 x 1 TB hard drives (one Western Digital drive + one Hitachi drive) so that I could mirror them with raid 1. When I checked disk management I saw that both HD's were formatted as basic disks but need to be dynamic disks to mirror. I converted both the primary and secondary HD's to dynamic through DOS Command Promt. (couldn't use the commands in Win 7. Either "greyed out" or non existant.) Everything was fine until I rebooted and nothing happened. I went back into dos to make the partitions active and on reboot it said no operating system found. I tried this on both HD's. I see that all the info is still on the disks and I can see that they are mirrored but I can't get it to boot. I'd appreciate any suggestions. Thanks.:confused:

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