I have written several posts in the past regarding regular computer maintenance. Keeping a regular maintenance schedule is important if you would like to protect yourself against viruses and spyware, as well as maintaining the computer performance. My latest post title Regular Computer Maintenance provided a tutorial on performing some standard maintenance on your computer.
In addition to the information provided in that post, there is an automated way of virus and spyware scanning as well as defragging your hard drive, all without you having to worry about it in the future. This post explains how to accomplish this.