Determine if you already have security software installed on your PC. Many times, you can upgrade to the 2008 version by simply downloading some files or having a new CD-rom sent to you. Call your security software provider or contact customer service via email.Know your PC. A huge step to take in choosing the right security software product is knowing what hardware versions work with which antivirus products. Do a little research online to see which products host software for your individual PC.Save money by going for a product offering a 2-3 user license. This allows your family members to utilize the software on their PC's as well.Consider your individual needs. If usability and easy installation is most important to you, go for a simplistic, user-friendly software product as opposed to one with multiple features.