1. use several different levels for passwords
Here are some basic things that you can do to decrease the chance that you will get security related issues with your PC:
There are a minimum of 3 levels. The 1st level is the password for your email account. Choose a difficult password, 10+ characters/numbers/other and don't re-use this password anywhere else. The second level is for all other websites and services that you use often. Keep a record of where you have accounts. The 3rd level is for accounts that you create that are not very important.
2. scan your pc once a week with Malwarebytes
You can download the program here: http://www.malwarebytes.org
3. install a virus scanner and do a full system scan at least once a week
You can download for example: AVG (http://www.avg.com)
4. check once a week if there is an update for Adobe Reader
5. check once a week if there is an update for Adobe Flash Player
6. check once a week manually if there are Windows Updates for your pc
