Hard drive help

Well, this might sound a bit strange but after I used dban and reinstall a new OS when I go to google and type in something I had before I installed it is there. Example: I type in "z8games" in google and then there will be a purple link (as if I clicked it) but after I reinstalled my OS and used dban.

Anybody know why this is happening/a way to completely wipe a drive?

P.S I use 2 hard drives, a 2tb 5900rpm and a 7200rpm 160gb.

I format both... But still...???

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