A legitimate, free computer security scan

Normally I advise against downloading or running "free security" scanners you may find on the Internet.  So many are bogus or are trying to sell you software.  Very few, if any, actually give a true, honest scan of your system.  Well, I found one for you.  From Sophos.com, they have available a free security scan.  Download and run it and it will check your system for items your Antivirus may have missed and check for other important security issues that may be on your system.  Yes, it is free, no obligation to buy anything.  Yes, it's free (forgive the repitition, lol)