based on the description of your findings it sounds like your system is part of a botnet. Unfortunately this is far from uncommon, and in most cases has nothing to with the legitimate owner of the system. Best advice is to run an anti-virus scan and handle the infection that way. If unsuccessful, rebuild the machine from the ground-up and proceed as normal.
If you have evidence of illegal activity from your investigations then I would advise passing the information to the relevant authorities, again proceeding as normal once the information is handed over.
Whilst I don't know the full extent of the information that you have, or believe you have, I would advise against hiring anyone; there are a lot of unscrupulous individuals willing to take advantage of those in a vulnerable position. Attempting to proceed further yourself may open you up to legal recriminations depending on the actions you take.
As for the remaining content of your posts I am not qualified to assist, I would suggest doing the same as you have done here, request the assistance of those more knowledgeable in the given field.