I am having a similar issue with Fusion 4.1.4. I have XP which runs OK (well as it always did - slowly!).
I also have Windows server 2008 R2 x64 . It has run faultlessly and fast until recently. It simply locked up. I couldn't even shut it down from the VMware menu, so I force closed VMware. I now get the 'Cannot find valid peer process to connect to' - even after replacing with an old working backup virtual machine.
My directory "/Library/Application Support/VMware Fusion/" does not have any file (especially boot.sh) other than the license key document.