A friend turned on his laptop today and the screen was frozen on the lock-screen, so he turned it off and back on. As it was booting up, it then said that it was trying to repair the C drive. Once that was done the lock-screen came back on and it was moving incredibly slow. We managed to log in after 10 minute of waiting. He doesn't know what led up to this and I asked if he'd done/seen anything weird the day before on it and he said no. I wasn't sure what it could be. I ran a malware scan just to see if it could be that. But nothing. Any thoughts? It appears to be working fine now, but I'm concerned it was something serious.
Edit: Before the lock screen appeared the second time around, it was on a black screen with working cursor for about 3 minutes.
The PC is about 2 years old
I'm not sure what information is needed for something like this.
Edited by Alex411, 23 July 2017 - 10:40 PM.