Passing input variable from PowerShell form to cmdlet argument results in blank data
Your Get-ADComputer filter syntax is broken
Change it to :
Get-ADComputer -filter "name -like '$global:x*' -and Enabled -eq 'true'" | Select -expand Name | out-file C:\Users\Admin1\Desktop\computers.txt And your script will work.
The article you followed is very out of date - there is discussion of what's wrong with it, and new updated examples from 2014 on The Scripting Guys' blog here