Follow the instructions in the main folder called INSTALLING INSTRUCTIONS.txt. You will also want to look in the HOSTS SET-UP folder and follow that as part of the installing instructions. Please follow everything to the letter OR it won't work. Please keep in mind this is CS 5.1 NOT CS5. Tested on Win7 x64bit.

Download :

http://www.filesonic.com/file/4151784685/Adobe_Photoshop_CS5.1_Extended_Edition.part1.rar
http://www.filesonic.com/file/4151784665/Adobe_Photoshop_CS5.1_Extended_Edition.part2.rar
http://www.filesonic.com/file/4151780825/Adobe_Photoshop_CS5.1_Extended_Edition.part3.rar
http://www.filesonic.com/file/4151780895/Adobe_Photoshop_CS5.1_Extended_Edition.part4.rar
http://www.filesonic.com/file/4151780885/Adobe_Photoshop_CS5.1_Extended_Edition.part5.rar
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http://www.filejungle.com/f/Dhpm7P/Adobe_Photoshop_CS5.1_Extended_Edition.part1.rar
http://www.filejungle.com/f/ghbu6K/Adobe_Photoshop_CS5.1_Extended_Edition.part2.rar
http://www.filejungle.com/f/P4b6GA/Adobe_Photoshop_CS5.1_Extended_Edition.part3.rar
http://www.filejungle.com/f/xya7b7/Adobe_Photoshop_CS5.1_Extended_Edition.part4.rar
http://www.filejungle.com/f/PaFTyj/Adobe_Photoshop_CS5.1_Extended_Edition.part5.rar