I'm using the AVAST as I see it is free and AVAST is quite reputable I guess (from the name)..
I scan and found 3 malware-ads, and deleted it, when i restart the laptop, the laptop are not starting up (This is the 1st time)..
Lucky there is a restore point created by AVAST earlier..

2nd time, I thought this has nothing to do with AVAST, so I install again and scan the computer, delete the malware-ads again.. This time I shut down my laptop. Next day, I switch on my laptop, found the same old problem, so I do system recover again as AVAST did restore point everytime u install it, but then, this time is not lucky for me, the system failed to restore back to previous restore point, so DOOMED..

End up I reformat my laptop..