If you’re using the media player that came with your operating system, you could do better. There are two alternatives in particular that would be a step up.
Malwarebytes’ Anti-Malware is a free antivirus program that can easily remove malicious software from your computer. It also has a paid version that can replace your current antivirus.
CCleaner is a maintenance program that cleans up your computer to keep it running smoothly.
Defragmenting your hard disk is a very important part of good computer care. Defraggler makes it easy to do, and is more effective than the stock Windows defragmentation tool.
If you’re using Internet Explorer or Safari (and, statistically, many of you are), you need to get a better web browser. Here’s how to try either Mozilla Firefox or Google Chrome on for size.