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This type of virus is a pain in the ass to remove. When my Grandfather's PC had this type of virus it took a long time to get it removed, and no software(malwarebytes, Avira) removed it at the time, though they may have finally caught on. I sadly don't remember how I ended up removing it, but you can look in your host file and see if they added something there, though I don't think this is the route the virus took when I had to remove it.
You can search for "search injection virus" or the sort and see if you can pull up any results.
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Viruses of this nature (google redirectors) are typically rootkits and have a reputation of evading your on-demand scanners like Malwarebytes. The nasty ones like to make a small 1 MB partition.
The easiest way to remove it is to use a partitioning cd or Windows' utilties diskpart.
If ComboFix doesn't solve the problem that's the next place we'll be looking.