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You really wipe your entire system once a year? Unless you're running w/o any protection and just surfing constant warez sites, etc.. or are doing deconstruction of virii.. then, that's a bit overkill. Most all infections can be remedied and totally reversed with the right person behind the controls. I've not had to wipe and reload a system due to infection for years now. There are several systems out there now that can remove the redirect problem you have, hell I just did this last week for a friend of mine. Just boot in to safe mode (less draw on system resources) and run through Malware bytes, etc and see what it comes up with. A lot of time, you'll see Explorer hijacks that redirect regardless of what web browser you're using. If you know where to look in the registry and how to notice file size/modification bits, you can find the problem and replace it with the correct information/file. Any A/V system can be thwarted with the right type of code and there are many out there that will actually disable them on an on going basis so you can't keep a solid protection system... so, you may have to do some manual editing of different files until you find the correct bits. Also, Process Explorer / Process Monitor are great tools to get an in depth look at what's truly going on inside your system.
Also -- let me just say this... Not all infections can be ridden by wipe/reload... Unless you're performing a full low-level wipe, then there is still data left in certain sectors by a simple fdisk and format.
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