Budget is a major deciding factor on the winner so don't over estimate.
I need a similar software application that is used on doublemyspeed.com.
This is a scan tool that can be downloaded by the customer for free at first to run a scan on their computer to find issues that might be slowing the computer down. Once issues are found, the customer needs to be prompted to visit a website or call an 800 number so they can purchase a support package to fix the issues found.
We are not looking for a fake tool to display fake information. The tool should show legitimate problems which will not show up if the customer uses our scan tool to scan their machine AFTER they have purchased support from us.
Prefer to have a registry scanner (since this will show the most amount of errors)
Spyware & Adware Infection (Preferred)
Rootkit, Virus, Trojan, etc (Preferred - if included, must include ability to update to latest malware definitions).