1. Service Pack 2 Xp 64 Bit

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. Refer this link. In fact, due to the earlier release date of the 32-bit version, many of the key features introduced by Service Pack 2 for 32-bit (x86) editions of Windows XP were already present in the RTM version of its 64-bit (x86-64) counterpart. Service Pack 2 is the first and last released service pack for Windows XP Professional x64 Edition. Service Pack 2 for Windows Server 2008 and Windows Vista (SP2) is an update to Windows Vista and Windows Server 2008 that supports new kinds of hardware and emerging hardware standards, and includes all updates delivered since SP1. In fact, due to the earlier release date of the 32-bit version, many of the key features introduced by Service Pack 2 for 32-bit (x86) editions of Windows XP were already present in the RTM version of its 64-bit (x86-64) counterpart. Service Pack 2 is the first and last released service pack for Windows XP Professional x64 Edition. After you upgrade from Windows XP to Windows XP Service Pack 2, the USB drivers appear with the earlier version numbers, even though the files have been updated. Resolution To resolve this problem, install Windows XP SP2, and then update the drivers for the USB devices that are connected to.

System requirements for latest version:System requirements | Acrobat Reader DC

These system requirements are for Adobe® Reader® XI software, v11.0. Because system requirements change with each software update, see the Release Notes for your software version for the latest information on supported operating systems and browsers.

• 1.3 GHz or faster processor
• Microsoft Windows® XP with Service Pack 3 for 32 bit or Service Pack 2 for 64 bit; Windows Server 2008 or 2008 R2 (32 bit and 64 bit); Windows 7 (32 bit and 64 bit); Windows 8 or 8.1 (32 bit and 64 bit)
  
• 256 MB of RAM (512 MB recommended)
• 320 MB of available hard-disk space
• 1024 x 768 screen resolution
• Internet Explorer 7, 8, 9, 10, or 11; Firefox Extended Support Release; Chrome

Note:

For 64-bit versions of Windows Server 2003 R2 and Windows XP (with Service Pack 2), Microsoft Update KB930627 is required.

• Intel^® processor
• Mac OS X v10.6.4, Mac OS X v10.7.2, or Mac OS X v10.8
• 1 GB of RAM
• 350 MB of available hard-disk space
• 1024 x 768 screen resolution
• Safari 5.1 for Mac OS X v10.6.8 or Mac OS X v10.7.2; Safari 5.2 for Mac OS X v10.8; Safari 6.0 for Mac OS X v10.7.4 or Mac OS X v10.8
  

• Intel 1.3 GHz or faster processor
• Microsoft Windows XP Home, Professional, or Tablet PC Edition with Service Pack 3 (32 bit) or Service Pack 2 (64 bit); Windows Server 2003 (32 bit and 64 bit; Service Pack 2 required for 64 bit); Windows Server 2008 or 2008 R2 (32 bit and 64 bit); Windows Vista® Home Basic, Home Premium, Business, Ultimate, or Enterprise with Service Pack 2 (32 bit and 64 bit); Windows 7 Starter, Home Premium, Professional, Ultimate, or Enterprise (32 bit and 64 bit)
• 256 MB of RAM (512 MB recommended)
• 260 MB of available hard-disk space
• 1024 x 576 screen resolution
• Microsoft Internet Explorer 7 or 8; Firefox 3.5 or 3.6
• Video hardware acceleration (optional)

Note:

For 64-bit versions of Windows Server 2003 R2 and Windows XP (with Service Pack 2), Microsoft Update KB930627 is required.

• Intel processor
• Mac OS X v10.5.8 or Mac OS X v10.6.4
• 512 MB of RAM (1 GB recommended)
• 415 MB of available hard-disk space
• 800 x 600 screen resolution (1024x768 recommended)
• Safari 4 for Mac OS X v10.5.8; Safari 4 or 5.0.x for Mac OS X v10.6.4

• Intel 1.3-GHz processor or equivalent
• Microsoft Windows 2000 with Service Pack 4; Windows Server 2003, 2008, or 2008 R2; Windows XP Professional, Home Edition, or Tablet PC Edition with Service Pack 2 or 3 (32 bit and 64 bit); Windows Vista Home Basic, Home Premium, Business, Ultimate, or Enterprise with Service Pack 1 or 2 (32 bit and 64 bit); Windows 7 Starter, Home Premium, Professional, Ultimate, or Enterprise (32 bit and 64 bit)
• 128 MB of RAM (256 MB recommended)
• 335 MB of available hard-disk space (additional space required for installation)
• Internet Explorer 7 or 8; Firefox 3.6 or 10 (ESR)
  

• PowerPC® G4, PowerPC G5, or Intel processor
• Mac OS X v10.4.11–10.5.8 (PowerPC); Mac OS X v10.4.11–10.6.3 (Intel)
• 128 MB of RAM (256 MB recommended)
• 405 MB of available hard-disk space (additional space required for installation)
• Safari 3.0.4 or later

• 32-bit Intel Pentium® processor or equivalent
• Red Hat® Linux® WS 5, SUSE® Linux Enterprise Desktop (SLED) 10 with Service Pack 2, or Ubuntu 7.10; GNOME or KDE Desktop Environment
• 512 MB of RAM (1 GB recommended)
• 150 MB of available hard-disk space (additional 75 MB required for all supported font packs)
• GTK+ (GIMP Toolkit) user interface library, version 2.6 or later
• Firefox 2.x or 3.0
• OpenLDAP and CUPS libraries

Service Pack 2 Xp 64 Bit

• 32-bit Intel Pentium processor or equivalent
• Solaris™ 10 u5 or OpenSolaris™ 2008.11, GNOME or KDE Desktop Environment (GNOME only for Solaris 10)
• 512 MB of RAM (1 GB recommended)
• 200 MB of available hard-disk space (additional 75 MB required for all supported font packs)
• GTK+ (GIMP Toolkit) user interface library, version 2.6 or later (on Solaris 10; also works with GTK 2.4.9)
• Firefox 2.x or 3.0
• OpenLDAP and CUPS libraries