My OS is: Windows 10.
It all started when my mozilla thundebird program crashed. After that I was unable to launch again because it freezed just after had been launched.
I looked for the file thunderbird is using. It is "Inbox" file which size is around: 4 188 405 760 B.
The problem I thought it was that in total commander I couldn't preview the file. While other 3 GB I could do with no problem.
So maybe disc problem? I run chkdsk, it did its job, launch system again and the same happened.
When I hit copy on that file, there was always 0% status but when I gave it some time, after about 5 - 10 minutes it started copying!!! smoothly
and stucked again on 99% but succeeded. File being copied to another disc cannot be opened either! Hell knows what has happened...
When I used teracopy application it said that it failed on setting end of the file. System copies that file successfully in the end.
What is more. I realized that WIndows deffender started hitting 30% of CPU showing from time to time files diagnosed as malware.
So maybe I have some malware?