Windows 7 unable to connect to mac

Hi

I've upgraded to Parallels 5 (build 5.0.9220) and have a virtual machine with Windows 7 on it. Two external hard disks attached to the mac show up and are accessible via windows explorer on the virtual machine but if I try to browse to the mac via the network I get an error message saying its inaccessible and "The endpoint is invalid".

The mac can see and access the virtual machine.

I use smartsync on the virtual machine to back up my windows files and this doesn't allow me to access the mac via the network.

Any ideas why I'm having this problem.

Thanks

Ruth