You seem to have a misunderstanding of Adobe Acrobat and Adobe Reader. Acrobat is the program used to create PDF documents and is not free. Adobe Reader (formerly called Adobe Acrobat Reader) is the software used to read PDF documents and is free; anyone can download it. And the Foxit Reader Patio mentioned, an alternative to Adobe Reader, is a smaller program and would take less disk space.
If, indeed, you have both adobe acrobat 4.0 and adobe acrobat 5.0 installed, why not at least uninstall adobe acrobat 4.0? Can you give a reason why you need two versions? And, again, do you use adobe acrobat at all? If not, then you could uninstall both versions.
And, surely, uninstalling adobe acrobat will not mess up adobe photoshop 5.0. Why would it? Is having adobe acrobat installed a system requirement for running adobe photoshop 5.0? As far as I know, it is not.
Deleting wap11 usb program should be no problem, since you aren't using wireless Internet connection.