(Fragmentation of files is what occurs when bits and portions of programs and files are spread out over sectors of the hard drive. This occurs over a period of time when files are deleted.)
* Do not open email attachments from unknown senders. They're prime candidates for viruses and spyware.
* Create a System Restore Point. This creates a time point within Windows if you install unstable software or encounter a power outage when conducting an update.
* Update Windows often as Microsoft regularly publishes security fixes/updates for both Windows, Office and Internet Explorer