Convertion of SBS2003 into VPC

Hi, I'm trying to convert a SBS2003 with 2 x 160GB SATA HDD (Setup as: Windows software mirror - dynamic disk) into Virtual PC. The backup and convert into VPC process was successful however when I attach it to Virtual PC 2007, it will bootup and halfway thru it will restart and show a blue screen error "Unmountable Boot Device". Please advise how to resolve this issue as the existing server hardware is aging and might failed soon.

Thanks in advance for any useful help.
Wong