Usually a file wdmaud.sys may be a common cause of Google Result Redirection, if it is in C:\Windows\System32 directory.
There is another, good one wdmaud.sys file and it is located in C:\Windows\System32\Drivers directory.
If you simply delete this file, the problem goes away, but will come back in several hours.
Try MalwareBytes to remove Google Redirect virus
Google redirect virus tend to infect the driver files in computer and there is no definitive answer to this problem. in my case, atapi.sys file was infected and as soon as the infection was killed using tdss killer, my search results stop redirecting. Also check dns settings, proxy and host file. This virus is now spreading in new ways and my all antivirus software failed to detect it. I was able to follow this Google Redirect Virus Removal method and got rid of the problem.
I'm willing to buy mcafee If it can deal with such problems. can anybody confirm this for me?