This seems like a networking issue between the Host computer and the Virtual Machine, please trouble shoot, and try NAT'ed, Bridge'd and/or Host only.
General network troubleshooting applies.
unfortunately I have no Virtual PC 2007 here to test - but I tried with Windows Virtual PC .
Pinging the virtual machine from the host works fine. So Cristobal is right - just basic network troubleshooting applies here .
Could you check what ipconfig tells us on the virtual machine? Can you ping from the host the IP that ipconfig shows?
I run a few servers through Virtual PC 2007 but I don't use Shared Networking (NAT) I select the adapter that my host machine uses for network connectivity (in this case wireless). I can ping from VM to host and from host to VM - in my particular network my host can't resolve the VM host names so I just added the names/IPs to the host "hosts" file.
Thanks guys. I'm working from home today so I'm off the corporate network and on my home network. I was able to get things working by assigning a static IP to the VPC session, changing from NAT to the NIC selection (in VPC) and then clicking the repair button. I'll try this again tomorrow from work but for now I'm in business.
You networking experts out there may already know this but when I am running a VPN connection I lose connectivity (can no longer ping) host and VPC sessions.
fyi...VPC is available here: http://www.microsoft.com/downloads/details.aspx?FamilyId=28C97D22-6EB8-4A09-A7F7-F6C7A1F000B5&displaylang=en