Would you please try to upgrade your Win 7 guest's hardware version to latest? Also update the vmware-tools to latest.
A while ago I figured out the cause though not the cure. I thought it would be good to at least post the cause here so that the next searcher has that.
It was USB flash drives mounted in the guest OS. I would only get the crashes when I had a flash drive mounted in the guest Win 7. It took a while figure out because it was fairly spotty as to when the crash would happen. But now I am a couple weeks with no crashes once I stopped mounting flash dives.
Not sure of how to fix it so I can use flash drives. But at least the system is stable.
Thanks for your reporting the issue. If you can stable reproduce the issue, would you please upload the dump files of windows 7? The files should locate the C:\Windows\Minidump folder. Minidump files are useful to us because they contain basic information like the error message associated with a blue-screen of death.