[Windows Vista] How to determine if Spyware has been installed?

[Windows Vista]How to determine if Spyware has been installed?

To determine if Spyware or some malicious programs, which will affect how the computer runs, been installed on the computer, use Windows Defender. Spyware and malicious software can, for example, cause the computer to run slowly, or pop out waste advertisements automatically, change settings on the Internet, or use personal information incorrectly.

Please refer to the following.

1. Click the Start button.
2. Click All Programs, and then click Windows Defender.
3. Click Scan.
4. After executing the scan, windows will present the results.
5. Check the presence of unwanted software or malicious programs on the PC from the results of the scan.

When the detected Spyware has been identified, all the information of Spyware Program such as the instruction of threaten, the location on the PC, t he evaluation of risk and commendatory action will be displayed.
Depending on the alter level of general threatens found, you can choose one of these following actions to apply to the software.
Ignore:  Allows the software to be installed or run on your computer. If the software is still running during the next scan, Windows Defender will alter you about this software again. 

Quarantine: When Windows Defender quarantines software, it moves it to another location on your computer, and then prevents the software from running until you choose to restore it or remove it from your computer.

Remove: Permanently deletes the software from your computer.

Always Allow: Add the software to the Windows Defender allowed list and allow it to run on your computer, and then it will never to be found during the scanning process.