windows 7 Virtual PC 07 setup

i am able to get windows 7 to boot and start the installation but before i get to select the partition i get a message saying;
A required CD/DVD drive device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now.

i am trying to install to a virtual machine using Virtual PC 2007.
i am able to install XP and Vista to this exact one, but get this message with 7. im somewhat unwilling to put this on a second PC if it comes with this error.

looking through the other posts i ahve tried to use vista to create a partition and format, that works, but then still get this error with 7.

i have tried the Installation and setup forum and was advised to come here

Download Virtual Box (freeware). Think you should have better luck. Hope this helps. :)

unfortunatly not, still get that same error

system is
e6850
4gb ram
vista 64 SP2
several 500gb HDD

avoiding Vmware as the new version is a pain to deal with in vista