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[fringbue]

The computer is slower and slower these days. Then I found pages are redirected to random domain at times. This happens more and more frequently. Even, ads appear on the visiting page to ask me to download software, buy cheap goods or get reward prizes... I learn that this program may even collect personal information. But Kaspersky failed to remove its remainings. What should I do then?

 

[RMerlin]

Run Malwarebytes's free scanner. It does a fairly good job at removing such malwares.

 

[coxhaus]

You need to control your DNS. In the router setup statements to block all DNS access except for your local ISPs or whom ever you use. If you get an ad trying to go rogue on DNS it will be blocked.

Run Malwarebytes as stated above. it is good.