restore WDK 8 to path, accidentally reverted recently
avoid bad output causing confusion in Get-ItemProperty calls
use the 32 bit program files location as recommended by aikidokatech
Merge pull request #22 from dickon/pathfix

restore WDK 8 to path and add some error actions to avoid output contamination
Merge pull request #24 from dickon/restoremakecert

Restore makecert script