User accounts replaced with "Other.."
After switching on my mac, I was displayed with like a loading screen..but it was different to a software update! After the device loaded (mid2012) I soon realised that my accounts had been replaced with "Other.." Which gives me the opportunity to sign in with a username & password but when I type my username & password it doesn't login.. I have tried using a disk repair on internet backup but that failed, I have also tried a disk back up boot. However this failed!
I don't want to reinstall my software- will that make me loose everything??
HELP ME!!
Many thanks
Kyle
MacBook Pro, OS X Mavericks (10.9.2)