How to confirm whether Spyware has been installed in Windows Vista?

Please refer to the following contents
 
Using Windows Defender, you can make sure whether Spyware or some malicious programs, which will affect how your computer runs, have been installed itself on your computer. Spyware and malicious software can, for example, cause your computer to run slowly, or pop out waste advertisements automatically, change settings on the Internet, or use personal information incorrectly.
 
For the contents of confirming whether Spyware has been installed in Windows Vista or not, please refer to the following steps.

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.According to the results of the scan, please confirm that unwanted software or malicious programs are inexistence on the PC.

When the detected Spyware has been checked out, all the information of Spyware Program will be displayed such as the instruction of threaten, the location on the PC, the evaluation of risk and commendatory action.
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 allows it to run on your computer, and then it will never to be found during the scanning process.