installed Flash Player, and something called www.search.searchpost.net also hijacked my search engine

Hi,

I branched your comment to a new post as it's slightly different than the OP from the other topic.  Your subsequent post, about using malware bytes wasn't branched along with this comment because it was a reply to the OP, not your comment.  Had it been a reply to your first post, it would have been branched as well.

Unfortunately, it sounds like a fake/malicious Flash Player installer was used as www.serach.searchpost.net isn't an optional offering for the official Flash Player installer.  Along with running malware bytes, I would run a full system scan (virus, adware, etc).

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Maria