Microsoft has built into Windows Vista,
an antispyware software called Windows Defender. This automatically scans your hard drive in search of malware and unwanted software. By default, only a quick analysis is carried out every day. For added security, I recommend you to make the place a comprehensive analysis, a little slower, but more efficient.
1. Click the Start button and then click Control Panel.
2. Then click the heading Security.
3. Click the shortcut to Windows Defender.
4. In the window that opens, click the Tools menu, then Options.
5. Pull down the list type zone automatic analysis and choose the option (complete analysis).
6. Finally, click the Save button.