Use Windows Security Center as a Starting Point

For a quick overview of your security settings, the Windows Security Center is where you'll find the status of your system firewall, auto update, malware protection, and other security settings. Click Start, Control Panel, Security Center, or you can simply click the shield icon in the task tray. If you see any red or yellow, you are not fully protected. For example, if you have not yet installed an antivirus product on your machine, or if your current antivirus product is out-of-date, the Malware section of the Security Center should be yellow. Windows does not offer a built-in antivirus utility, so you'll want to install your own. For free antivirus, I recommend AVG Anti-Virus 8.

Use Windows Defender as a Diagnostic Tool

The Malware section also covers antispyware protection, and for that Windows Vista includes Windows Defender. The antispyware protection in your antivirus program usually trumps the protection Microsoft provides, but there are several good reasons to keep Windows Defender enabled. One is that every antispyware program uses a different definition of what is and what is not spyware, so redundant protection can actually offer some benefit.

Another reason to keep Windows Defender enabled: diagnostics. Click Tools, and choose Software Explorer from the resulting pane. You can display lists of applications from several categories such as Currently Running Programs, Network Connected Programs, and Winsock Service Providers, but Startup Programs is perhaps the most useful. Click on any name in the left window, and full details will appear in the right pane. By highlighting, you can remove, disable, or enable any of the programs listed.

Disable the Start Up menu

Windows Vista keeps track of all the documents and programs you launch in the Start Up menu. This can be convenient for some users, but it can also compromise your privacy if you share a computer within an office or household. Fortunately Windows Vista provides an easy way to tweak this setting. To protect your privacy, follow these steps:

1. Right click on the taskbar and select Properties.
2. Click on the Start Menu tab.
3. Uncheck Store and display a list of recently opened files.
4. Uncheck Store and display a list of recently opened programs.
5. Click OK.