It was a BSOD. Windows couldn't find a driver and couldn't repair it.
First thing I would have done is get hold of a "live" Linux operating system on a USB stick (this is easy to do, look it up), boot your computer from that and see whether you can read anything off the drive.
If not, you could try recovery software (but that sounds like what your PC "dealer" did and it didn't work?) --There are reputable companies you can look up online that can usually recover data from any drive (unless you got some ransomware or something that encrypted it). Look for one that won't charge you if they can't.
sounds like windows update is still working right.
Actually I think it said likely "cannot find drive or something like that" it seems to me like the message when you leave a non booting cd, dvd, or floppy in the player and windows doesn't look for a hard drive when it's set to boot from a disk first then focuses only on the disk not trying to find a harddrive with a boot sector. That Metallica cd I forgot in the coffee cup holder stopped my system from booting..
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