i was using avast > read the bottom part of my post
no other antivirus, but avast did mention baidu is on my pc
i've checked on add/remove program at control panel but no baidu thingy
and i've never installed baidu with or without intention; i always check if i'm installing or downloading things, so i'm sure it's not installed through downloads or installation i knew
(i've cleaned the registry, using adwcleaner, JRT, malwarebytes)
but still cant install avast