Windows host unable to ping linux guest vms

I have a brand new Windows 7 system (the host) and I've installed Workstation 9.

I have two Ubuntu guest machines installed.

My system is connected to a local router all on the 192.168.1.x subnet

Here's my problem:

My guest systems can ping each other, the internet and other systems on my local subnet.

The host can reach the internet and other systems on my local subnet BUT NOT the guest systems.

Both quest systems are configured to have a Bridged Network Connection.

I've shutdown the windows firewall and that doesn't seem to help the situation.

Any help or information would greatly be appreciated.

Thanks!