Laptop troubleshooting forum: Please help, my computer goes rogue on me

If you are using AVG, then that is probably your problem. The "Free" version of AVG is ineffective against Malware and Viruses. My guess is your computer is probably loaded with stuff you've picked up. If you can afford a Security Suite get one. I would suggest Trend-Micro, or Kaspersky for $$$ paid security suites. For good "Free" protection get Avast "Home User". I've been doing Home Computer repair for 15 years, and I find that people are often infected by a number of ways and for a number of different reasons. And quite often it's because their Security allowed malicious software to be installed.
If your computer has developed, "a mind of it's own", then it is because you either 1. Have far too many programs installed, and need to remove any unused programs. OR 2. Have been taken over by malware of some sort.
My sugestions are;
1. Remove AVG, and install Avast.(Run a boot sector scan.){A boot sector scan will take a while(1-2 hours) since it scans the computer before it boots into Windows.}
2. Install Malwarebytes Anti-Malware, do a Thorough System Scan. (This will also take alot of time(1-2 hours), but will be well worth it.) Remove any Malware if found.
3. Remove any unnecessary Programs that are no longer being used, or have never been used.
4. Run MSCONFIG. Remove auto-updating software services from the boot."They will run anyway whenever you use the program(s)."
5. Run your Disk Clean-up utility.
6. DEFRAG your HD.
7. Reboot
8. Be sure to have your "File Sharing" Turned OFF, while connected to Wi-Fi, since it is unlikely you will know anyone at any HOT SPOTS.
9. Have a nice day.