Dual Booting Server 2008 beta with server 2003

[chromewaves]

I am currently running server 2003, and would like to test out server 2008 beta. After I install server 2008, it boots fine, and then when I boot into server 2003, it boots fine, but then when restarting to boot into server 2008 (or 2003) again, just after boot up I get a disk read error, how could I resolve this?

Thanks in advance.