Resuming a virtual machine on my Windows 7 x64 always leads to a blue screen.
Before I had only 4 GB in my host machine and the guest systems had less than 4 GB RAM. With this no problems with resuming at all.
But not with my 8 GB host machine and guest VMs with more the 4 GB of RAM a resume always lead to blue screen.
This helped my out:
Start your VMWare Workstation with XP Compatibility Mode and as an Administrator.