What you are dealing with is a computer virus. Get another computer, and restore the seed phrase on that computer, reinstall the infected computer (because anti-virus is so awful at detecting viruses in the first place that it just kills running programs).
If it is a computer virus, OP should use Internet security, antivirus software to have better protection.
The best protection is don't do stupid things when surfing on Internet. It is a first barrier against hackers. The second layer of barrier and protection is software.