Odds are, nothing will be harmed in deleting it. What you can do is try booting into safemode and log in as the administrator and try to delete it that way. If that doesn't work, you can always hook up your hard drive to another computer and delete it from in there.
"as a fanboy i refuse to admit it and will pull countless things out of my butt to disprove it"
Team Thelegorm! Total Kills: 21 (i iz in uor profile, editsing your sigz)