once again the HGFS feature has caused problems for users,
see post HGFS Service fails to start
why don’t VMware just change the default for silent install of VMtools for Guests running under ESX.
however the crux of the matter is do not install Vmware tools with the complete option on ESX guests. This installs the shared folders feature which is not available on ESX. This causes the VMware tools to keep a file (hgfs.dat) open and can cause errors when logging off a guest. To disable the shared folders feature, remove hgfs from the registry key ProviderOrder under KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order\.
See http://kb.vmware.com/kb/1317 for more information.