Better safe than sorry

Better safe than sorry: If you're unsure that a file or program is clean, scan it for malware before you open or install it

Find out if a file or program of 10MB or less is free of malware by uploading it to www.virustotal.com, a free service which scans submissions using a combination of antivirus engines. VirusTotal detects viruses, worms, Trojans, and other kinds of malware that any one antivirus application might miss.