If you had the SATA
drivers loaded before (and I presume you did), the PC crashing suddenly is more of an indication of sudden hard disk failure -- since Windows now can't find the
drivers. And, yeah I know you can see the drive contents from the command line, but the disk damage may be affecting the files needed to boot into the desktop.
Suggest you visit the Seagate site and if they have a drive daignostic utility, see if that can be downloaded. You may have to connect this drive to a different PC to install and run that utility.