Within Windows 8 security is paramount, as is Windows 8 maintenance. Learn more about how Windows 8 protects your computer here.
You may occasionally experience problems with your computer after opening certain files or applications from the Internet, which can affect your system settings. System Restore is often the easiest way to fix these kinds of issues. System Restore allows you to "rewind" your system settings to an earlier point in time, called a restore point. Keep in mind that a system restore will not erase your recently created files, nor can it be used to recover lost documents or other files. However, it may uninstall recently added applications and drivers.