Problems with Baidu anti virus?

Hey friends,
I use Avast antivirus for my windows 8.1 and this PC is new just a week old. I got an adware in my PC while downloading a software from unknown source. So what I did is removed that adware and scanned m PC completely to check if any virus is there Avast showed nil results. To double check I uninstalled Avast and the installed Baidu anti virus and it showed that my PC is still infected and when I clicked to remove the threat it won't do anything. So please tell me which anti virus I should trust now and use it
