My computer once got glitchy and choppy. It eventually went read only. It wouldn't let me copy, move, send or even rename any file, not even to an USB drive. At some point, 19 out of 20, it wouldn't even boot up or get stuck at a black screen, and it was getting worse by the day. No backups, no chance of making one. For a couple of reasons, I guessed the hard drive was dying and taking revenge for a little accident I had with it, but I really wasn't sure.
The only thing I could think of was to have everything read out and transfered 1:1 to a new hard drive, without booting up. I also needed its two pre-installed OS on the new drive, but I was never given their installation CDs.
There was nobody who could help me with this. People usually come asking me for help, just because I have the skill to type a problem into google and follow a few steps. Oh yeah, and for some reason, I had some porn on my desktop I now couldnt do a thing about, so either way, I was on my own.
So without a clue what I was doing, two days and two nights, I somehow made the new drive an exact clone of the old one. Only very few files were damaged at all, and all of them were garbage.
Other than that, I got some ransomware which blocks your computer from doing anything. There are so many variants of this shit, and I got the one that also blocked off every single known method of circumventing and deleting it.
This was the only time that second preinstalled OS (Vista) came into use. Since I rarely used it, I could boot it up just fine, the virus didn't affect it, and I could go ahead and rinse it out of the system. Whoever made it, SUCK IT!