sfc /scannow: unable to repair some errors; error 800f081f

It also begs the question (for which there is probably no answer), why are there so many errors after a clean installation?

I've read that it can take up to 3 attempts before sfc /scannow does it's business.

I had problems getting Outlook to send emails & couldn't resolve it with sfc /scannow which I confess I only ran once before reading the above. But I somehow managed to get it to send emails by uninstalling Outlook 2007 & reinstalling from a different MS Office 2007 set of disks. It failed because of an error in file, creating further problems with a duplicated email account entry which I eventually managed to delete. Somehow, reinstalling from the original disks resolved the sending emails problem.