Apple App Store is used for Account. How to Avoid It? How to Delete All Sharing Preferences?

Question

Every time I go to the Apple App Store, I have intrusion, relentless stalking, piggy back computer usage, ID Theft, Account takeovers, and theft problems on everything including all brands of email accounts. I keep changing the ID and the passwords intermittently, but attacks continue. Erasing or replacing the HD does not remedy the situation either.
As of now, the computer has practically empty; 979.87 GB free out of 1TB. It may have a couple of notes, pdf's, and some bookmarks. It was recently erased and is running on the OS X 10.7.5 to avoid Apple App Store updates to Mavericks, Pages, Keynote, etc. The security was set on everything I could think of to use the internet safely. 
Besides surfing the web, I only did a few things. Because Chrome is better recommended, I used Safari to download Firefox, then used Firefox to download Chrome. Safari won't download it directly. I checked Yahoo mail. I used the Apple ID to post a question in the Apple Communities (within 24-48 hours of today). I changed the password to Apple ID in case there was an issue later. (I have to change the password almost 100% of the time because it gets stolen often) I usually erase Firefox because I don't use it. This time I left it there while I worked on other things & erased it later.
After reading some online material, the system started to run slow as though there was too much data or space being taken up. Then I felt that someone or someone was using it at the same time. I disconnected the Ethernet and left an idle screen (it will sleep after a few minutes) because no sharing options remained. All fields are depopulated. All internet connection options were turned off and removed. Only the Ethernet remains. Unfortunately, that Bluetooth button can still be turned "on" and/or "discoverable". I don't know it this will still work with Bluetooth turned off  and removed in Sharing. Please clarify that for me.
When I returned, the screen saver was changed. I expected to use a password to get back onto the computer, but no password was needed. I checked the settings and found the password for logging onto an idle & sleeping screen was removed. No one physically changed things around. This was done remotely or through malware.
I checked various system preferences, and found the locks to Sharing was open with some of the components set up for usage (public files, bluetooth, remote apple events, etc.). I tried to change some options, but some items did not move. I tried to lock it but it would not lock. I tried other sys pref screens and found that some of them had been dismantled too.
I tried to open the lock for other changes, but the password to System Preferences was changed.
Is it normal to get a password popup window to LOCK users & groups when it is OPEN? I don't believe you need a password to lock it. Eventually, open locks closed with no chance to immediately reopen it to adjust the preferences (all passwords were changed).
The terminal looks like it was used. No history was found. Reseting Password rejected new passwords. iTunes sharing could not be changed and parental control refused to lock. After waiting an hour or two, was able to lock it. I wonder what it was being used for.
Now that the internet and the network are disconnected (before sending this message), everything is still extremely slow. A single window takes a long time to open. I have no idea what is making it drag and I don't know where to look.
If history is repeating itself, then the computer is set for piracy just like before. Every place I go is watched, all passwords are captured, all files are checked, all email accounts can be stolen, chat and messages are used (email & computer), iTunes will be logged into, other types of accounts are stolen/taken over, and everything I type is read. Any changes will be sabotaged.
I am confident that someone in the Apple Community will have the answers to getting rid of this problem for good. If you don't have all the answers, then perhaps you have good resources and referrals (not speculations or guesses).
I read about apps, software, or devices that either detect or deter this type of problem. What are they and how do they work?
Q- Also, exactly what are the steps to transfer the OS X 10.7.5, Mavericks, and the future Yosemite to a flash drive or disk to avoid future contact with the Apple App Store or using the Apple ID? (external HD's have been sabotaged in the past-via remote or erasing program of some sort)
Q- How to permanently get rid of Messages & Chats
Q- How to permanently remove Dropbox & Public file sharing?
Q- How to permanently remove all sharing options?
Q- Are there other ways to share (codes, commands, etc.) that need be to blocked/fixed/patched? If so, then what are they?
Q- Are computers stalked by IP address? by Network? by computer numbers or codes? or just by traps or their accounts?
Q- Is there a handy, "go to" type of checklist of where to look or what to do when there is a a suspicion of implants in the computer?

Answer 1

See Recover your iTunes library from your iPod or iOS device.
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