your explorer.exe shell is banjaxed but your data is probably there intact .
to run explorer , hit the combination of <ctrl> <alt> <del> keys , then into task manager, then into processes and file menu new task.
type
explorer.exe
the desktop should appear. if you have a burner start backing up.
otherwise ask tech friend to put hard drive into their machine, copy data to cd or dvd , check its all there and then put the HD back in your own box and scrub it (format drive and reinstall operating system)
keep your anti virus up to date from now on