Windows 7 has many new features out of which one feature is Windows XP Mode which lets you to run Windows XP on your Windows 7 however in order to use Windows XP mode you must have Windows 7 Professional or Ultimate and your computer must have hardware level virtualization support.

DOESNT REQUIRE LOADER OR KEY!
This if a Fully Working and Tested Version
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Requirements:
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1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
16 GB available hard disk space (32-bit) or 20 GB (64-bit)
DirectX 9 graphics device with WDDM 1.0 or higher driver

Based on: Windows 7 Ultimate x86 build 6.1.7600.16385 RTM

To install Windows Tiny7 from this CD, set your PC
up so it will boot from the CD-ROM in the PC's BIOS.

There is no upgrade option available in Tiny7, because the option
is removed.

Only install Tiny7 onto a freshly formatted partition or hard disk.

You do not need any product key in this release - the installation
of Tiny7 is unattended, apart from in the very beginning where you
choose which drive or partition to install to.

All installations are set to US English. If you do not want the US
keyboard settings, you will have to change this in Windows when it
has installed (as opposed to choosing it at install time), its easy
enough, just open the "Keyboard Settings" folder in the desktop
eXPerience folder and read the included ReadMe.txt that is there.

Adobe Photoshop CS5 Extended software is the ultimate solution for advanced digital imaging, delivering all the editing and compositing capabilities of Photoshop CS5 plus breakthrough tools that let you create and edit 3D and motion based content.

Upgrade to Windows 7 Professional. With Windows 7 Professional, fewer walls stand between you and your success. You can run many Windows XP productivity programs in Windows XP Mode and recover data easily with automatic backups to your home or business network. You can also connect to company networks effortlessly and more securely with Domain Join. With all the exciting entertainment features of Windows Home Premium, its a great choice for home and for business. Need to use multiple languages on your PC or help protect your data with enhanced BitLocker security? Get Windows 7 Ultimate.