Better stick to your faucets for now i don't think your computer will be vulnerable to viruses because all people here in bitcointalk were once a newbie and i think their compiter have never been infected by viruses including me . Your computer won't be infecter by these unless you've installed a malware . Faucets are the best way to get free bitcoin especially for the newbie although it just paying a little amount but at least you earming and exploring . And stay away from various investments , just like what you have said they are almost a scams .