Nothing
Looks like a virus.
I'm not sure completely...as this started happening on April 1st (April Fools Day).
The day this happened doesn't matter. That could either be 1) a coincidence or 2) a virus that was designed to start damaging the machine on April 1st. Regardless of what you think it is, it is still malicious.
maybe its a real virus that was put on your computer as an april fools prank
2) a virus that was designed to start damaging the machine on April 1st.