RVHOST.EXE -AVAST(high cpu usage)

This week i got two laptop with the same problems, which show the similar probems:

-folder option disable
-task manager disable
-regedit disable
-msconfig disable
-high temperature
-high cpu and RAM usage
-restart after 5-10 minutes
-blue screen of death (BSOD)

this problems similar to pc which infected by autorun virus, and i manage to remove them by using avast home edition (startup scan). I would like to say that avast is one of my favourite antivirus but it use pretty high capacity of RAM so i only use it whenever a pc infected and remove it after the virus succssfully remove, if you use avast and feel like it, you can use it. The main virus i found is infected RVHOST.EXE, and it will say that it is in the system files avast will prompt "are you sure", just delete it because you cant neither repair or move to chest, and it will not cause any problems to your system if you delete it, if you have another solution you may share it here.