Oh Ouch! this isn't good!!
that is a sign of the Hard Drive being corrupted or damaged.(could be caused by an incomplete update or corrupted update).
Please put try recovering the registry, by putting the windows disc in and select the repair option, it asks for the admin password. If you are unable to do so, then that means you don't have a backup partition on the computer.
If you still cannot get into your computer, I would advise to reinstall Windows, you do get the option during the install to save your current files, sometimes it doesn't work 100% though. So if you have files on your computer that are not not easy to get back(irreplaceable), I would advise to take the hard drive out, take it to a Data Recovery Center(most local computer shops can also, get your data off the hard drive) Then get a new hard drive and install windows.
If you have a warranty or the unit is less then a year old it's best to contact the manfacturer for a replacement/repair as they offer 75% off services.
Sorry to come bearing bad news, please don't shoot the messenger.
Glad I could be of assistance and God bless; Happy Holidays!