When a virus is found, then you will receive a free 30-day license to remove the threat. If nothing is found (and we sincerely hope so), then you will never need a license. It is designed to check if your security measures work. HitmanPro offers you a Free Scan for a second opinion. It can be run straight from a USB flash drive, a CD/DVD, local or network attached hard drive. It scans the computer quickly (less than 5 minutes) and does not slow down the computer (except for the few minutes it is scanning). HitmanPro is designed to work alongside existing security programs without any conflicts. HitmanPro is a second opinion scanner, designed to rescue your computer from malware (viruses, trojans, rootkits, etc.) that have infected your computer despite all the security measures you have taken (such as anti virus software, firewalls, etc.).