Hi John, definitely something not right for you.
For the record, I downloaded the 32 bit .exe version and the 64bit msi version from the link I first replied with. 1MB and 1.3MB respectively and fast with no licence or other requirements.
Slipstream called your first course of action. For what it's worth, I use Avast free version. Only because I personally use Avast do I mention it to you.
Likely you have your own anti virus solution and I encourage you seek advice if needed.
I highly recommend Slipstream's advice as your immediate course of action.
The 7-zip.org is legit and I am sure your problems are not related to that site.
All this sub-solder stuff sets off a red flag for me
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Run a full virus scan and see what you get.
Google malware and educate yourself. Stick to the better known anti-virus brands however. "Super Duper Awesome Free Malware Antivirus" advertisement from no name websites are to be treated with care. No such thing as a free dinner.
Good luck and let us know!