You have done several online scans and nothing malicious has shown up - so the HiJackThis logfile probably isn't needed.
And you're probably not infected - so that answers your 3rd question from above
The answers to the other 2 questions may/may not be related - and it's gonna take a bit of troubleshooting to figure it out. When I usually see these symptoms, I think of malware. Have you recently removed any malware from the system? It's possible that the removal of malware could cause these issues.
Next, I'd suggest opening up Task Manager (Ctrl-Alt-Del)
Then click on the View menu item
Then on the Select columns selection.
In the next window, put a checkmark next to "IO Reads" and click OK
Then be sure to click the box to "Show processes for all users" in the lower left.
Then double click on the IO Reads column to sort it by the IO Reads.
Are the items at the top of the list significantly larger than the rest of the stuff? If so, let us know the Image name of the largest one's.
You can also double click on the Memory column and the CPU column to see if anything doesn't look right there.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
)**If you need a more detailed explanation, please ask for it. I have the Knack
. ** If I haven't replied in 48 hours, please send me a message. My eye problems have recently increased and I'm having difficult reading posts. (23 Nov 2017)FYI - I am completely blind in the right eye and ~30% blind in the left eye.
<p>If the eye problems get worse suddenly, I may not be able to respond.If that's the case and help is needed, please PM a staff member for assistance.