Check mo nlang muna sa Task Manager sa process na tab. Check mo kung merong unwanted exe file. Click mo End process tree/end process. Check mo rin sa start up kung may mga di ka kilalang exe file doon, delete mo lng din. Once na may ma verify ka na unwanted exe file, probably yan na ang hinahanap mo na virus. Para di na mag run ulit, go to gpedit.msc, User Configuration --> Administrative templates --> System --> Don't run specified Windows Applications --> Enabled, lagay mo lng don yung unwanted exe file. Done. Hopefully this will help you. Thank you.