After installed Avast! free antivirus 2015.10.2.2215 Sp1 windows explorer is restarted 3 times a day.I am useing windows8.1 pro 64bit.I Performed a clean install.Ondemand Scaner is Malwarebytes Anti-Malware Premium 2.1.4.1018.Is it virus effect or anyting else?Pls help