Of course you might have antivirus and firewall protection installed on your computer, but are you sure that they are protecting you from every new threats?
Use Sophos Threat Detection Test to find any viruses, spyware, adware or zero-day threats that might have by-passed your existing protection. The test utilizes Sophos antivirus scanning engine and their unique Behavioral Genotype Protection.
The test can be run without uninstalling or deactivating your current anti-virus software and it will checks performance of Symantec, McAfee, Trend, CA, Kaspersky and F-Secure security programs.
More information and download the free Threat Detection Test from Sophos.