Window Xp Service Pack 3

Windows XP (SP3) was released to manufacturing on April 21, 2008, and to the public via both the Microsoft Download Center and Windows Update on May 6, 2008.

A feature set overview which details new features available separately as stand-alone updates to Windows XP, as well as backported features from Windows Vista, has been posted by Microsoft. SP 3 can be installed on systems with Internet Explorer versions 6, 7, or 8. Internet Explorer 7 and 8 are not included as part of SP3. Service Pack 3 is not available for the 64 bit version of Windows XP, which is based on Windows Server 2003 kernel.

New features in Service Pack 3

Turns black hole router detection on by default.
Support for SHA-2 signatures in X.509 certificates
Network Access Protection client
NX APIs for application developers to enable Data Execution Prevention for their code, independent of system-wide compatibility enforcement settings
Group Policy support for IEEE 802.1X authentication for wired network adapters.
Installing without requiring a product key during setup for retail and OEM versions
Credential Security Support Provider
Descriptive Security options in Group Policy/Local Security Policy user interface
An updated version of the Microsoft Enhanced Cryptographic Provider Module (RSAENH) that is FIPS 140-2 certified (SHA-256, SHA-384 and SHA-512 algorithms)