Adobe Photoshop CS4

System Requirements
Windows
* 1.8GHz or faster processor
* Microsoft® Windows® XP with Service Pack 2 (Service Pack 3 recommended) or Windows Vista® Home Premium, Business, Ultimate, or Enterprise with Service Pack 1 (certified for 32-bit Windows XP and 32-bit and 64-bit Windows Vista)
* 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

Mac
* PowerPC® G5 or multicore Intel® processor
* Mac OS X v10.4.11–10.5.4
* 512MB of RAM (1GB recommended)
* 2GB of available hard-disk space for installation; additional free space required during installation (cannot install on a volume that uses a case-sensitive file system or 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

If you want to download it for free.
Find it at this link: http://bit.ly/cWgq1f