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Here is a PowerShell program that prints a beautiful welcome screen using asterisks (*):

```

Write-Output "****************************************************"

Write-Output "*                                                   *"

Write-Output "*  WELCOME TO POWERSHELL SCRIPTING WORLD          *"

Write-Output "*                                                   *"

Write-Output "****************************************************"

Write-Output "*                                                   *"

Write-Output "*  Author: [Your Name]                             *"

Write-Output "*  Date: $(Get-Date)                               *"

Write-Output "*                                                   *"

Write-Output "****************************************************"

```

This program uses the `Write-Output` cmdlet to print a welcome screen with a border made of asterisks. You can replace `[Your Name]` with your actual name.

When you run this program, it will print:

```

****************************************************

*                                                   *

*  WELCOME TO POWERSHELL SCRIPTING WORLD          *

*                                                   *

****************************************************

*                                                   *

*  Author: [Your Name]                             *

*  Date: 09/09/2024 12:00:00                       *

*                                                   *

****************************************************

```

Note: The `$(Get-Date)` part prints the current date and time.