Hi adamleeds,
You will have to uninstall Norton 360 Spanish version and install the English version of Norton 360. Please do the following if Norton 360 is the only product on your computer:
Depending on the edition (Standard or Premier) of Norton 360 you have got, please download the latest installation package (English) from the appropriate link below and save it to your desktop.
Norton 360 Standard Edition version 3.5
http://www.norton.com/n360s_3
Norton 360 Premier Edition version 3.5
http://www.norton.com/n360p_3
Download and save the Norton Removal Tool to your desktop from over here:
http://www.symantec.com/norton/support/kb/web_view.jsp?wv_type=public_web&ssfromlink=true&sprt_cid=1a13409b-29db-4397-a286-9dec49f8e252&seg=hho&ct=us&lg=en&docurl=20080828154508EN
NOTE: The Norton removal tool will wipe out any other Norton products installed on your computer, so only use the removal tool if Norton 360 is the only product on your computer.
Also, please keep your Norton 360 product key handy, just in case. You can get it from your Norton account over here:
https://www.mynortonaccount.com/amsweb/default.do
Note: Norton product keys are not sensitive to language versions or language changes. You can use your product key and switch the language of your Norton product without any problems.
Please disconnect from the internet and run the removal tool twice, rebooting after each run. Then install Norton 360 and connect to the internet when it wants to connect to the web. The removal tool leaves your product key behind, and Norton 360 should pick up your key automatically.
Please post back with the outcome. Thanks :-)