Really weird stuff happening, please help

Hi

so i have spent quite some time trying to figure this out on my own. last thing that happened. I pressed control and the start button to get into safe mode and I see my user name twice and with the same user pic. I added my password to both it worked but didn’t completely log in, it’s shutdown now.

before this I suddenly shut it down because I was searching in recent files in finder and I found all these photos that were accessed a week ago but I never viewed any photos. and it seems there is second copy of each file but it’s a different file type.

I was trying to get to the folder it was in and trace it back the folder was “A” and another “5”. And then I couldn’t move my cursor it. It seemed like I lost control of the cursor and the cursor moved it self went to view and hit sort. But I disabled the internet. I also remember activity monitor a few hours ago had finder cpu at like 98% or something not sure if it has anything to do with this.

And I think what started it all was a downloaded file that was supposed to be safe. Then I found when I would try to google it would send me to yahoo. Then when I found that another user name was added and a profile in system preferences. Deleted them. I ran malwares, found malware deleted it but couldn’t delete it in launchdeamon folder. i ran etrechek(?), and I had posted results on here they told me my hard drive and battery was failing, didn't say anything else. But after an erase, I checked for errors but those weren’t found. . So I had backed up my files, I erased everything and now I’m running on OS X. But I have to update my computer to newer systems.

I know how people jump to being hacked, but why would files I didn’t access show up in my recently open folder, could the back up have caused this? I know it’s a far stretch too with no internet and the cursor still moved and clicked something. that’s a little weird.

Im starring at a black screen, wondering what I should do. Any help would be greatly appreciated.