Written Based on My Experience

http://communities.vmware.com/thread/301880?start=0&tstart=0

– Right click My Computer
– Select Properties from the context menu
– Select the Advanced system  settings
– Click Environment Variables button
– Select Path in the System Variables and click Edit
– Add the following line “;C:Program FilesVMwareVMware VI Remote CLIPerlbin” to the Path variable

or
– Click Environment Variables
– Under System Variables Click New and enter the below
– Variable New – Pat
– Variable Value “C:Program Files (x86)VMwareVMware vSphere CLIPerlbin”

Restart the command prompt  for the Path to take effect

if stilll error, try to reinstall vShpere CLI

Thanks, CMIIW