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I run Photoshop CS4 on Windows 7 Home Premium. Portable is probably meant for things like flash drives. Downloading the regular version should solve the issue.
And, if I may ask, what version of Windows are you running?
You can purchase a legal version or download a trial version of Adobe Photoshop here or Adobe Photoshop Essentials here (Windows) or here (OS X). You can also download free alternatives GIMP and Paint.NET here and here, respectively. There is a portable version of GIMP available here, as well. There is not a legally available portable version of Adobe Photoshop to the best of my knowledge, and trying to support a cracked version of a program is not only irresponsible, but nigh-impossible due to the changes made to the program in the cracking process.