|To start with, unplug the network cable from the back of your computer. Doing so will disallow anybody who may be remotely controlling your computer from doing so.|
A new drive labelled "Q" isn't conclusive evidence your PC has been hacked and taken over by someone remotely.
My recommendation at this point would be for you to get it to a qualified professional and have them check your system. A reputable shop will tell you in advance what their hourly rate is, and it should take no longer than 1 hour for a diagnosis as to what your problem is. It might take more than that to also fix the issue, depending on what's wrong, but I know I could probably troubleshoot your PC in less than an hour (most places will bill you one hour regardless of whether it takes 5, 15, or 45 min's to do the diagnosis).
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.