Gavin is very right. Do not just fall for anything on the web. There are a lot of malicious software and websites that can harm you, your data and make use of it for their own mean benefit. Your systems can be compromised and used as bot for any cyber attacks without you having any knowledge of it. Take precautions while using the web and do keep in mind "All that glitters is not gold". Keep your anti malware programs upto date and use standard procedures and protocols. Do not make use of untrustworthy sources.