Just a quick question. When I replace the RUU rom.zip file with the eris_rootrom.zip , does it matter what I name it? I'm just been naming it "rom", but I'm wondering if it shuold be named rom.zip?
Yes, "rom.zip"...that's the one that the RUU is expecting...try that and let us know.
edit: you might need / want to change Windows Explorer to not "hide extensions for known file types" (this can be done in Organize drop-down in the top-left of your Explorer window, then select "Folder and search options", then the View tab, then un-check the "Hide extensions for known file types"); that way, you can ensure that your file is really called what you think it should be.

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. Nice to have that syntax handily available.