cannot revert to an older snapshot on a virtual machine

I'm trying to revert to an older snapshot, and I'm getting "invalid virtual machine configuration" in 4.0.  I assume this is because the memory, processors, or something don't match (these were changed.)  Is there a way to determine what the older snapshot needs the settings to be so that the VM is compatible with it?  Thanks.
thomsoneAsked:
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Danny McDanielClinical Systems AnalystCommented:
if you go to the VM's directory on the datastore, you can look through the vmware.log files to see what it had, depending upon how long ago the changes were made.

The files might  be a little cryptic to read, but you might do a command like 'grep 00001.vmdk vmware.log*' from the console while in the VM's directory.  This should list out all of the times the snapshot disk (assuming it only has one snapshot) was opened and that might tell you when the snapshot was taken.  Then open or "less" that vmware.log and you should be able to decypher the various settings for the VM.
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