According to the files in the folder and the logs it looks like there was an issue with the VM (assumingly in October 2011) and the VM was reverted to the base disk, rendering the existing snapshot useless!?
What you may do - after ensuring you have a full backup - is to cleanly shut down the VM, then move all the snapshots files (the .vmdk files with 00000x in their file name) to another folder and power on the VM again. If it works as expected you may delete the obsolete files.
André