Adobe Photoshop CS CS2 CS3 CS4 CS5 Portable

Adobe Photoshop is a graphics editing program developed and published by Adobe Systems Incorporated.
System Requirements
Windows
* 1.8GHz or faster processor
* Microsoft® Windows® All versions XP/Vista/7
* 512MB of RAM (1GB recommended)
* 1GB of available hard-disk space for installation; additional free space required during installation (cannot install on flash-based storage devices)
* 1,024x768 display (1,280x800 recommended) with 16-bit video card
* Some GPU-accelerated features require graphics support for Shader Model 3.0 and OpenGL 2.0
* DVD-ROM drive
* QuickTime 7.2 software required for multimedia features
* Broadband Internet connection required for online services

Steps:

Just start the exe files
and wait 3-10 minutes (depending on how powerful is your PC)

Enjoy and Cheers!!!