Pay attention to any degradation in computer performance, slower startup times, the system freezes unexpectedly or your system shuts down or restarts for no reason.Crosscheck the list with your anti-virus protection to make sure you're safe from the latest threats. Check technology websites such as McAfee's Virus Information center, Trend Micro's Internet Security Level or Norton's Threat Explorer to see if any current viruses exist that affect Mac systems.This option appears either by right-clicking on the taskbar icon or by opening the program and then the 'Update' menu. Update your virus definitions before running a virus scan.
