Its time you need to detect those spywares from your computer similar to removing harmful web content.The Windows Defender is a software which protects your computer from spyware threats and other potentially unwanted software which get installed into your computers. Along with protection the software also offers security, blocks unwanted popup’s and increase your system’s slow performance. A total size of 4.9Mb the WindowsDefender.msi is offered for free to all the genuine windows operating system customers who can directly download from the downloads section of microsoft.com
Link to download free windows defender
With a Real time protection which can secure your computer along with the Antivirus program already installed on your computer, Windows Defender can make sure that all your data is secured and you dont lose any data. By default this software protects all the users who are listed under the User Accounts with or without administrative privileges. If you run a illegal version of windows operating system you are not eligible to install this software since the installation process is stopped in the second step itself which is validation of your operating system.
Currently Windows Defender is supported by all the operating systems released after Windows 2000 ie Windows Server 2003 Service Pack 1, Windows Server 2003 Service Pack 2 & Windows XP Service Pack 2 but from the installation page it seems that windows defender is not currently available in Windows Vista.
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windows defender