Windows XP is a produced by as part of the family of operating systems. It was released to manufacturing on August 24, 2001, and broadly released for retail sale on October 25, 2001.
Development of Windows XP began in the late 1990s as "", an operating system (OS) built on the which was intended specifically for mainstream consumer use. An updated version of was also originally planned for the business market; however, in January 2000, both projects were scrapped in favor of a single OS codenamed "Whistler", which would serve as a single OS platform for both consumer and business markets. As such, Windows XP was the first consumer edition of Windows not to be based on . Its predecessors are Windows 2000 and Windows Me. tha minimum requirement of this os are at least 64 MB of RAM (128 MB is recommended), CD-ROM or DVD-ROM drive,Video adapter and Monitor w/ Super VGA (800-600)or higher resolution,Sound card,Speaker or headphones.
Windows 7 is a personal computer that was produced by as part of the family of operating systems. It was on July 22, 2009, and became generally available on October 22, 2009. It was previously known by the codenamesBlackcomb and Vienna. Windows 7 has the version number NT 6.1. Since itsrelease, Windows 7 has had one service pack. Its predecessor is the Windows Vista and the minimum requirement are the following:
1 (GHz)or faster 32 bit (x64)processor
-1 (GB) RAM (64 Bit)RAM (32 Bit) or 2 GB RAM (64- Bit)
-166B available hard disk space (32 Bit) or 20 GB)(64Bit)
-Direct X 9 graphics device with WDDM or higherdriver.
And lastly the Windows Server 2008 R2 it was released on July 22, 2009 and became available on October 22, 2009. Its code name is whistler server r2 while its predecessor is Windows server 2008. the minimum requirement are PROCESSOR with1.4 GHz speed,MEMORY-512 MB RAM, AVAILABLE DISK SPACE-32 GB and OPTICAL DRIVE- DVD-RAM drive.
