If you're running Windows XP with Service Pack 2 (SP2) and you're not ready to upgrade to Windows 7, you should install
Windows XP Service Pack 3 (SP3), a free update.
As Microsoft Support for Windows XP with Service Pack 2 (SP2) will end on July 13, 2010.
And Microsoft Support for Windows Vista without any service packs already ended on April 13, 2010
If you're running one of these versions after support ends, you won't get security updates for Windows.
Because we need the security updates apart from a good security software,incase we wont get the updates our computer would
be vulnerable to infections
The recommended (and easiest) way to get SP3 is to turn on Automatic Updates, which can automatically download SP3
when it's available for your computer. You just need a few clicks to begin the installation and the rest of the process is
automatic.
In order to install SP3, you must first have Windows XP Service Pack 1a (SP1a) or Service Pack 2 (SP2) installed. These are
also available when you have Automatic Updates turned on.
Or you can visit below link to download the service pack 3 for your Windows Xp and there is also link to download service
pack 2 for your Vista
Note : There's no SP3 for the 64-bit version of Windows XP. If you're running the 64-bit version of Windows XP with SP2,
you have the latest service pack and will continue to be eligible for support and receive updates until April 8, 2014.
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Click Here To Download Xp sp3
&
Click Here To Download Vista sp2
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