ipad settings icon missing

My ipad crashed today and when i rebooted it - only mail and music icons on the main screen. Only a few of my other apps reappeared. My Settings; itunes; safari; all not there. They are not on another page or folder. I've done the soft reset - holding down sleep/home button til the apple appears. Nothing works. Now i'm trying to restore and backup from my computer but it's telling me I have to go to my settings on the ipad and turn off the Find My ipad setting. I can't do that because the Settings isnt there. If I do a full factory restore will I be able to do the backup from the cloud then?? Any help would be appreciated!