Assorted Ways to Detect .NET 4.0

CMD / BAT
 
@echo off
reg query hklm\software\microsoft\.NETFramework\v4.0.30319 >nul
if %errorlevel%==0 (
    echo found
) else (
    echo not found
)
 
VBScript Registry Test
 
Set oShell = CreateObject("Wscript.Shell")
On Error Resume Next
bKey = oShell.RegRead("HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\")
If err.Number = 0 Then
    wscript.echo "found"
Else
    wscript.echo "not found"
End If
 
PowerShell Registry Test
 
if (test-path hklm:\software\microsoft\.NETFramework\v4.0.30319) {
    write found
} else {
    write not found
}
 
VBScript Folder Test
 
Set objFSO = CreateObject(“Scripting.FileSystemObject”)
If objFSO.FolderExists(“C:\Windows\Microsoft.NET\Framework\v4.0.30319”) Then
    wscript.echo “found”
Else
    wscript.echo “not found”
End If
 
PowerShell Folder Test
 
If (test-path $env:windir"\Microsoft.NET\Framework\v4.0.30319") {
    write found
} else {
    write not found
}
 
VBScript WMI Win32_Product Test
 
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2")
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_Product WHERE Caption LIKE '%.NET Framework 4%'",,48)
For Each objItem in colItems
    Wscript.Echo "Caption: " & objItem.Caption
Next