Berserk87, on 20 February 2012 - 01:06, said:
it looks like that command is from windows xp.
runas is a ubiquitous command that has existed in XP, Vista, 7, 2003, 2008 and 2008R2... it may even have been in 2000 and NT4 too, but I can't remember that far back. It
is not just a windows xp command.
Where are you trying to run sfc from? In the recovery console?