I would strongly advise not to go for a 6.5 R1 reinstall anymore.
But do a recent version, currently 11.0.0, from the PowerShell Gallery with Install-Module.
You better check your PowerShell version as well (with $PSVersionTable).
Ideally you should aim at PS v5.1.
It is very important that you clan up all old versions.
Do a uninstall from the Control Panel, but then also remove all PowerCLI directories.
You can check which directories by displaying $env:PSModulePath.Split(';')
All folders starting with VMware in any of the folders listed shall be removed.
That is all mentioned in the post I pointed you to earlier.