There are several "Free Scan Sites" on the net these days.
So far all of the ones I've tried, From Ecelerate on down all have some basic flaws in them ..
You have to open your Computer to the Internet and allow a Total Stranger Complete access to EVERY File and scrap of Private Info about YOU.
And given Security as it exists on the Net today, You never know who all else just might be rifling through your PC at the same time.
And then on top of that, you have to have faith that they will NOT use the info to Profile You and your Familys habits on the Internet.
Then there is the question of just how above board the Scanning Company really is.
When they scan Your PC .. Are they actually looking for ALL Instances of Spyware / Malware / Adware ???
Or are they just looking for instances of Their Competitors Spyware for deletion and leaving spyware/Malware behind that will be sending info about what you are doing on the net and Offline too, back to them the next time you logon to the net.
Remember ... Even downloading something as simple as a screensaver that catches your eye can load Spyware / Malware to your system.
Freeze is one company that uses this tactic to "Give" Free Screensavers and other desktop goodies to the Unsuspecting Public.
Now for the scenario:
You download a "Free" FREEZE Screensaver or Wallpaper.
You load it to your harddrive, and lets say that you actually read and understand each and every section of setup that shows up and you elect to to NOT have anything but the screenasver load...
You have just installed spyware / malware to your PC.
Now you go onto the net and have your PC scanned.
Unknown to you, the Scanning Company is in reality owned or controlled by the same company that "gave" you the "free" screensaver.
Now when they do the scan, all they eliminate is all the spyware / malware that their Competitors have on your PC and leave theirs behind to do their job.
Now you go playing on the net secure with the thought that you have just eradicated all tracking/profiling software you had on your PC, when in reality, instead of sending ALL your personal info to a bunch of companies .. you are sending it to only one or two, that Will sell the collected info to others.
So, before letting a website on the net have total unrestricted access to your PC, RESEARCH them completely.
Remember ... Once Pandora's Box was opened .. Couldn't get the things back into it.
The same applies to your PC.