If you don't have a router GET ONE! SPI ( stateful packet inspection) will prevent unsolicited access to your computer. Get a better firewall rather then the built in Windows version like, Comodo Firewall, Armor online or Private Firewall. Before you install a software based firewall scan your computer with Malwarebytes, Herdprotect and SUPERAntiSpyware Free Edition. To ensure your firewall doesn't learn a rouge routine. I would also run TDsskiller for rootkits. If you REALLY want protection check out Untangle.
Social Networking sites such as Facebook can be hacked usually by clicking crap that gets delivered to your E-mail. If you get anything in your E-mail that says log in here to view this post DON'T DO IT! You could go through all your security settings in Facebook and change things. Like only allow yourself to see who your friends are. Remember that certain so-called apps that advertise Facebook color changes and shit are rouge. Above all else common sense goes a long way.
Do you have a router? I can tell you how to change your IP address by using the MAC address clone feature. Unless you are using PPOE DSL. I heard you can change your IP address in PPOE, but I can't remember off hand how to do it. Would have to Google.
Consider using multiple E-mail addresses. One for forums and junk and one for your bank, PayPal, eBay, etc. I have more than four E-mail addresses. Use a VPN.
https://torrentfreak.com/which-vpn-services-take-your-anonymity-seriously-2014-edition-140315/
You know how you have to answer a secret question to retrieve your password? Don't give a direct answer. Like if the question is, "what is your favorite color." Don't answer by saying green, instead say, "three bears" or something that is completely random that only you know the answer to. Mine is always a sentence.
http://www.digitalspy.com/tech/feature/a552990/how-do-i-make-my-facebook-profile-private.html
In Facebook search for Facecrooks and add a subscription and be sure to click get notifications so you don't miss anything.
http://facecrooks.com/
http://facecrooks.com/Internet-Safe...ccount-for-maximum-privacy-and-security.html/