Links to the most common software
Malware (http://www.webopedia.com/TERM/M/malware.html) is commonly spread from software downloads not originating from the actual manufacturer itself. The malware is cleverly packaged (and hidden) within the software that you are downloading. This happens frequently when someone is using a search engine (http://www.webopedia.com/TERM/S/search_engine.html) to look for a software program and clicks on the first few links that come up on the search results. It comes down to doing your due diligence...