Using Wscript.Shell to execute VBS script gives Permission denied Error 70

When executing the below code (TestVBS) gives Permission Denied Runtime Error 70.
This script below has been simplified for testing, but this method use to work just fine (for many uses).
I can double-click the testmsgbox.vbs and it executes OK.
I have located the vbs file in C or H drive where no file access permission would be an issue.

I would appreciate help or solution to this issue.
Thanks in advance.

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Code within testmsgbox.vbs file

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Hi Leith, it's been a while since I have needed to use this forum. And you have helped me a number of times, some years back.
So good to see you are still on the team here.

I have run your code, but without success. ret returns a 5.
So presumably this is "The operating system denied access to the specified file."
So do not understand why this would be the case. I have located the vbs file on C or H drives (my local drives) without success.

What else do you think is the cause/solution ?
Thanks, appreciate your help.