The disc is the same as the original disc that would of came with your system. The XP Media Centre Edition DVD does not contain Service Pack 3 as the Media Centre components installer does not function if Service Pack 3 is slipstreamed. Likely you will get the error that your XP installation is newer than the installation disc if you try to use the installation disc to repair it. You are best to clean install (you will lose all programs and files) and then install the standalone Service Pack 3 after Windows is installed.  See Windows Reinstallation Guide/A Clean Install of Windows XP (page 209) for more details: [URL] Note if you do have files to recover files see page 413 Data Recovery of the Hard Drive using Fedora before proceeding with the clean installation.  
Huge Problem. A lot of WIndows files missing. Most functions/programs don't work or launch. System restore not functioning etc. etc. I don't have the original OS install disk, if there was one. But a couple of years ago Dell sold me a reinstallation DVD Win XP Media Version 2005 with Update Rollup 2. The disk says "already installed on your computer. I ordered it thinking it would fix some file issues back then but it never worked - saying this isn't the same XP version on your PC. So I gave up-untill today. I tried the DVD today and it appears that it might be able to install a complete (but older) edition of win xp on my machine. If I succeed will  I lose all of my existing programs,documents etc etc. Thanks in advance..
Win XP Media Center Edition - (ver 5.1)SP3 is corrupted in Dimension E310