Note that many websites have their own advertising, unrelated to adware.
The program is a rogue anti-spyware application that reports false positive installations. These false positives are to trick users. So that this can lead into paying freepcscan.com to enable Spyware Slayer and clean their PC.
Its EULA also claims to give the user information to third party, show adds, etc.
From EULA :
Use of web bugs allows FreePCScan.com? to track certain websites that an individual may visit online.
Web bugs are also used to assist in ascertaining the products and services that individuals are interested in and to track online behavioral habits for marketing purposes.
However, by submitting that information to FreePCScan.com?, you grant to us the right to use your personal information for any legal purpose including, without limitation: a) marketing purposes such as sharing your information with third party advertisers; b) providing promotional offers to you by means of e-mail advertising, telemarketing, direct mail marketing, online banner advertising and/or package stuffers; c) transferring your personal information to a third party, when necessary, to receive a product or service that you may have ordered from such third party while using the Website or when responding to offers provided by FreePCScan.com?; d) tracking compliance with our Terms and Conditions; and e) for validation, suppression, content improvement and feedback purposes.
Credit Card information In connection with most purchases and transactions that take place on the Website, FreePCScan.com? will collect your credit card information.
The entities that advertise and/or place banner ads on the Website are independent third parties and are not affiliated with FreePCScan.com?. Minors/COPPA FreePCScan.com? does not knowingly solicit or collect information from visitors under 18 years of age.