I haven't had a problem with spyware or adware entering sweeps from this site. I don't enter from anywhere else, though.
95% of the sweeps that are listed here are from major corporate sponsors - big companies that aren't trying to illegally collect info or compromise their customer's computers. They want to make & keep customers for their business, not steal & sell information -or- make money sending out 3rd party spam.
I'm no expert on hardware or networking, so I'm afraid that I can't help you fix your problem :-(