You're welcome.
Personally I would leave the windows.old in place, there have been many instances of bugs/collisions after a windows feature update. I would suggest leaving it in place for 30 days, I think this is the MS advised limit after that a rollback may not be possible.
Unless of course you have any space limitation on you hard disk, which for a new system (if you meant "the PC is only a few wdays old") shouldn't be an issue.