• Bootstrap.vbs can't be found, yet, it exists in "C:\Program Files\SMTPing"
  
• Can't find script engine "VBScript"

They come up by one of the next reasons:

• Using Windows XP with a Service Pack below SP3 or no Service Pack at all
  
• Some nasty update on Windows Vista
  
• A very kicky security software that blocks the Windows Scripting Host

The workaround for these cases is the next:

1. Open "C:\Program Files\SMTPing\SMTPing.ini" with a text editor.

2. Search for "BootStrap.vbs". You'll get to line 105 or so.

3. Comment that line by prepending a semicolon to it and remove the semicolon of the next line.

From:

Action: shellexecute; FileName: "BootStrap.vbs"; Parameters: """%ChromiumPortable%"" ""%WebRoot%"""; ShowCmd: hidden
; Action: shellexecute; FileName: "%ChromiumPortable%"; Parameters: "%WebRoot%"

To:

; Action: shellexecute; FileName: "BootStrap.vbs"; Parameters: """%ChromiumPortable%"" ""%WebRoot%"""; ShowCmd: hidden
Action: shellexecute; FileName: "%ChromiumPortable%"; Parameters: "%WebRoot%"

Now launch SMTPing and you'll be fixed, but...

Please be adviced that when you update SMTPing, you'll most likely lose this change. So to permanently fix it, you have to deal with your security settings and:

• Allow "C:\Program Files\SMTPing\SMTPing.exe" to run as a full privileged user, or
  
• Whitelist it or flag it as trusted/secure in your security programs, or
  
• Check if something's blocking .vbs files to be properly executed by the Windows Scripting Host.