TOTALLY NEW TO THIS

I am totally new to all of these, so if I sound ignorant that is because I am. The main reasons that I want to download the portable apps to my pocket hard drive is because I do not wish to inadvertently be infected with virus and spywares from the Internet, and because I often need to use the computer in the local libraries and I do not wish to leave traces of my personal info there. Please bear with me. I have several dumb questions to ask you:
(1.) Do I need to have an external drive specified as a "U3" device in order to use these portable apps features here. Because my Seagate Pocket Hard Drive does not have that specification.
(2.) I downloaded the "standard" version of portable apps to my Seagate Pocket Hard Drive already, however, I was not able to open the file. When I tried to open it, it says "7-zip diagnostic messages: F:\portable_apps_suites_standard_1.0 exe is not support archive".
So, I downloaded the "7z" file to my Seagate Pocket Hard Drive. But I was still not able to open the portable apps.
So, I followed the instruction and downloaded the "resource editor" to both my laptop's hard drive and to my Seagate Pocket Hard Drive. Unfortunately, I was not able to understand the following instructions:

"Now, copy the file named 7z.sfx to 'Copy of 7z.sfx'
Open and patch the file named 7z.sfx thru XNResourceEditor.exe
Dialog - 137 (0 'caption', and 1020 'caption' and 'width')
Icon Group - 159 (delete resource then 'Import image resource' of your own)
Version - 1 ('File description' and 'Internal name')"

Please kindly provide me with detail specific instructions. Thank you in advance for your cooperation.
Sincerely,
Henry