FixWin10ShellExp.ps1

# Tested with Windows 10 Tech Preview build 9926
# 
# The following PowerShell script can be used to re-initialize the Shell Experience in Windows 10.
#
# WARNING: All store apps will be reinitialized meaning any local data associated with that app will
# get reset.
#
# This seems to be necessary if restoring from a restore point.  When a restore point is used, 
# the Start Menu, Cortana, and the Notification Area no longer work

param (
[switch]$IsRunAsAdmin = $false
)

$ScriptPath = (Get-Variable MyInvocation).Value.MyCommand.Path

function BeforeStart {
	Stop-Service 'wuauserv'
}

function AfterFinish {
	Start-Service 'wuauserv'
}

function RepairStep1 {
	Write-Host 'Step 1 of 2 starting in 5 seconds (press any key to cancel...)'
	$canceled = KeyPressOrSleep
	if ($canceled) {
		Write-Host 'Canceled'
		return $false
	}
	
	Write-Host 'Starting repair step 1...'
	
	Get-AppXPackage -AllUsers *shellexperience* -PackageType bundle |% {Add-AppxPackage -DisableDevelopmentMode -Register ($_.installlocation + "\appxmetadata\AppXBundleManifest.xml")}
	
	Write-Host 'Done'
	
	return $true
}

function RepairStep2 {
	Write-Host 'Starting repair step 2 of 2 in 5 seconds (press any key to cancel...)'
    Write-Host 'Note: don''t worry if you see a few errors here...'
	$canceled = KeyPressOrSleep
	if ($canceled) {
		Write-Host 'Canceled'
		return $false
	}
	Write-Host 'Starting repair step 2...'
	Get-AppXPackage -AllUsers |% {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
	
	Write-Host 'Done (a few errors are normal)'

	return $true
}

function KeyPressOrSleep {
	$counter = 0
	while(!$Host.UI.RawUI.KeyAvailable -and ($counter++ -lt 20)) {
	      Start-Sleep -Milliseconds 250
		  if ($Host.UI.RawUI.KeyAvailable) {
		  	$Host.UI.RawUI.FlushInputBuffer()
		  	return $true
		  }
	}
	
	return $false
}

function StartOperation() {
	BeforeStart
	try {
		$success = RepairStep1
		if ($success) {
			$null = RepairStep2
			Write-Host 'Exiting in 5 seconds (or press any key)'
			$null = KeyPressOrSleep
		}
	} finally {
		AfterFinish
	}
}




#################################################
# Everything below is boiler plate code for     #
# re-executing self with "Run As Admin" enabled #
#################################################

function RelaunchProcessElevated {
 	try {
		$RelaunchArgs = '-ExecutionPolicy Unrestricted -file "' + $ScriptPath + '" -IsRunAsAdmin'
        $AdminProcess = Start-Process "$PsHome\PowerShell.exe" -Verb RunAs -ArgumentList $RelaunchArgs -PassThru
		return $AdminProcess
    } catch {
        $Error[0] # Dump details about the last error
        exit 1
    }
}

function RunAsAdmin {
	if (-not $IsRunAsAdmin -and ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
		$IsRunAsAdmin = $true
	}
	
	if ($IsRunAsAdmin) {
		Write-Host 'Starting Operation'
		StartOperation
	} else {
		Write-Host 'Elevating'
		$AdminProcess = RelaunchProcessElevated
		
		while (-not $AdminProcess.HasExited) {
	        Start-Sleep -Seconds 2
	    }
	}
}

RunAsAdmin