First time here- Dealing with annoying bug

Hi,
This is my first time here and it was about time I suppose. I have had this computer for about 4 years and it has never shown symptoms of infection until just a few days back. The computer was running fine until after I finished downloading an episode of Son's of Anarchy. I realize that by doing so I am putting myself at risk, and trust me it will not be happening again. Anyway, the first thing that I noticed was a "Solve PC issue" message telling me to change the Windows Update settings. Naturally I clicked it, but would not let me make such change (I cannot remember what the prompt was and I do not dare click it again). The second odd thing I saw was that every time that I boot my computer a web page launches and it's immediately blocked by browser with a warning about a possibly unsafe page. Finally, I have noticed three files titled "DECRYPT_INSTRUCTION.HTML (.TXT)" sprinkled among several folders including my Downloads folder, my C: folders and even the MGtools folder (I saw it while attaching the logs).
I tried running several of my own anti-malware programs (Malwarbytes, SUPERAntiSPyware and SpyBot) that found items; I followed the default action. I realize this is not ideal before coming to these forums, but since both Malwarebytes and SUPERAntiSpyware are no longer finding anything, and I am still having problems, I decided to come here for help.
I have followed the READ ME instructions fully and I am attaching the logs.
I appreciate any help you may be able to provide.
Thank you for your consideration of my issue,

 

Fantastic!
Good thing that this is my older computer.
Thank you for your help