what do i do? did my hard drive crash?

[browserblow]

when I turn my pc on, it gets me to the login screen. but the text and many elements are missing like icons.sometimes the guest account has a password but i never put one. i ran diagnostics and found harddrive problems. startup repair doesnt work and no system restores because it was relatively new so i never made one. any suggestions or help would be appreciated

 

[browserblow]

now its saying "missing operating system"

 

[gregrocker]

Work through these steps which include everything that can be done for Troubleshooting Windows 7 Failure to Boot