ListGUIDs.ps1

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# File : ListGUIDs.ps1
# Version : 1.0.0
# Purpose : List globally unique identifier (GUID) of programs installed.
# Synopsis: 
# Usage : .\ListGUIDs.ps1
# Author: Leonard Lee <sheeeng@gmail.com>
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# References:
# Filtering and Formatting Data
# http://technet.microsoft.com/en-us/magazine/cc162469.aspx 
# http://technet.microsoft.com/en-us/magazine/2007.04.powershell.aspx
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$uninstallRegistryKey = Get-ChildItem HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall

$programsInstalled = $uninstallRegistryKey | ForEach-Object {Get-ItemProperty $_.PsPath}

Foreach ($program in $programsInstalled)
{
    #Write-Host $programsInstalled.Displayname $programsInstalled.ModifyPath
    $programsInstalled | Select DisplayName, ModifyPath
}