Watch out, there's adware about

Google has teamed up with an anti-malware organisation to offer warnings when search results might otherwise lead surfers to sites hosting malicious code.

Please Create a Basic User Account for Every Day Computer Use

There's an old rule in computer security called 'Least Privilege'.  This means that a user or program is granted minimum possible privileges to permit an action. In doing so, the operating system as a whole is not exposed to unwarranted or excessive actions that may cause damage or promote further negative actions.