Are you running Windows 10?
How did you attempt to start PowerShell?
You should be able to type "Powershell" into the Search the web and Windows box, click the Desktop app, and select "Run as administrator".
If not Windows 10 then what OS version are you running?
EDIT: Update.
Had a few available minutes and checked on something I remembered:
You can set a restore point in PowerShell via the CheckPoint-Computer cmdlet.
And you can delete update files as well; Here is a link:
http
/www.scconfigmgr.com/2014/11/18/remove-expired-and-superseded-updates-from-a-software-update-group-with-powershell/
May be going off topic a bit as I am not sure if you just need to get it done or need to use .vbs per se.
In anycase Powershell is quite potent - so much to learn. And I am not one to reinvent the wheel and will look for solutions that I can modify or otherwise tweak to my purposes. Hence the links....