Stop using the computer as an administrator for day-to-day work. Whenever you are on the Internet with an administrator account, software can install itself without your explicit permission. Display of web page content: if page content includes elements that need to be downloaded to view correctly, your browser may offer to download, infecting your machine.
The ads or popups often look like a legitimate warning from your operating system or antivirus software. Legitimate sites can even be hijacked into hosting drive-by downloads though third-party ads. The objective is usually to install malware, which may:
Websites you visit can download and install software without your knowledge or approval.
