With so many being stolen, it's not just transactions online you need to worry about, it's your computer itself. Do you store sensitive information in your computer, such as a file with all your passwords in it? If you do, you need to password protect your computer and encrypt your files.
In Windows, encrypt a file by right-clicking on it and choosing 鈥淧roperties鈥. Under the 鈥淕eneral鈥 tab, click 鈥淎dvanced鈥 at the bottom. Then click 鈥淓ncrypt contents to secure data鈥 and click 鈥淥K.鈥