I just tried downloading a newer version of MiKTeX from the MiKTeX site and a huge amount of sketchy junk, including shop to win and blekko seemed to come with it, scaring me off. Is this safe? And can anyone tell me what is going on?
The download files you can get from the side MiKTeX 2.9 Setup (Joseph Wright already posted this link in his comment).
If you chose to download the basic installer, then there’s a selection of mirrors possible. Perhaps the preselected one have sent the adverts.