This site is just another example of offering a free scan of your computer by downloading a program called "PC Speedscan" which will surely find lots of infections/problems and then offer to remove them if you purchase the software.
The problem seems to be that most of the "found" problems are not there. But you will have problems after installing their software namely adware galore.
Avoid this site (www.finallyfast.ca) with a vengeance.
ANY site selling the FREE PC SpeedScan Pro software should be avoided.