Hi Helen,
Which product did you download? The adverts at the top of the tweak3d site are generated by Google. Not one of them is particularly good, and a couple are adware in their own right. This doesn't detract from the general info provided, as the site doesn't choose those ads, they turn up automatically.
Keep Norton.. if it's working properly (there have been a few problems, but they can be fixed) it's just about the best protection on the market.
Have a read through the post of recommended
free products that I placed in the same topic. Adaware, when set up as I stated, will find and fix most spyware, and used in conjunction with Spybot works very well (and free). If you have any particular problems feel free to start a new post, (just to stop this sticky getting too long..)
and I'll be happy to help you out.
Cheers
Liam