Does your internet browser ever display ads that just seem wrong — for example, an inappropriate ad on a kid’s website, an ad that blocks content on the page, or an ad on a government site? It might look something like this: Unwanted software could be to blame. Free downloads sometimes come with hidden software that can: cause your computer to slow down or crash modify your security settings, greatly increasing your risk of viruses inject scammy and inappropriate ads into your browser make it difficult to remove the software