My computer is infected with rvhost.exe. When my computer is started, The task manager shows .

Seems to be gaining popularity:
https://www.askmehelpdesk.com/internet-web/os-infected-rvhost-exe-57096.html

Edit ot add:
Also --> AntiVirus Solution and Removal - W32.Yautoit.N (http://www.precisesecurity.com/computer-virus/wytn-dec18.htm)

Ezatul... go to this link and you'll get the answer on how to remove the rvhost.exe problem:

https://www.askmehelpdesk.com/spyware-viruses-etc/how-remove-rvhost-exe-malware-71164.html