Fix acceptance tests when running on 32-bit version of 2003

The acceptance tests made assumptions that we were running on 64-bit version of 2008, and started failing after we re-enabled the windows acceptance jobs. This commit updates the tests to not trying to manage redirected registry keys/values when running on 32-bit OS. It also handles the case where the sysnative file system alias is not present (and 2003 and earlier).

The tests passed in https://jenkins.puppetlabs.com/view/Modules%20-%20Platform%20Owned/job/Cooper%20Registry/label=acc-coord/8/