Would you trust a third party developer to provide you with a new service pack for Windows XP?  There is currently a beta version of SP4 developed by one 'harkaz' that you can download and install by following the link at The Inquirer on 32-bit versions of XP with at least SP1 installed.  There are updates to .NET, MCE and a variety of hotfixes in the Service Pack so the majority of the patches are already officially available as individual updates from Windows Update, just rolled into one easy to install package.  The one major change is the POSready registry setting which will allow machines to get the updates intended for Windows XP Embedded which is supported until 2019.  Check it out, if you dare.

"The developer, who is known as "harkaz", has been working on the service pack since last September. It will work on any version of Windows XP with at least Service Pack 1 applied and can easily be slipstreamed into installation media for fresh installs."

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