Need huge help on my router WRT120 N thanks

Hi, new here, really needed some help regarding my Linksys router WRT 120 N, which i bought not too long ago. Long story short, had it for ps3 online and it worked terrific, tried to get it too connect with the 360 and a disaster. 
My idea was too uninstall anything Linksys has and then reinstall the same router. I figured that way i could go back to the previous settings before i tinkered with them for the 360, and just start fresh with a new SSID and have an easier time that way. So i tried, a number of times, but everytime i do, it says the program/router is already installed, leaving me with little to no idea what to do to get it back to workign with the ps3, let alone ever trying for the 360.
By the way, as you may tell, im pretty much tech illiterate, didnt grow up around it and now that i have it, it confuses me quite alot. I feel most comfortable just figuring out how to uninstall it, that is my preference, but if some one knows how i can fix it without doing that and getting my 360 and ps3 online with it,  would also appreciate that. I migth not understand lingo, but im very driven to get this over with, i have been pulling my hair out for  hours trying with my very limited knowledge.
Again, any help and all help is so so very appreciated, thank you so much in advance.
If you need any other information, please dont hesistate to ask me.

Before using the setup program again, you will need to reset your router to factory defaults.
To reset your router to factory defaults, use the following procedure:
1) Power down all computers, the router, and the modem, and unplug them from the wall.
2) Disconnect all wires from the router.
3) Power up the router and allow it to fully boot (1-2 minutes).
4) Press and hold the reset button for 30 seconds, then release it, then let the router reset and reboot (2-3 minutes).
5) Power down the router.
6) Connect one computer by wire to port 1 on the router (NOT to the internet port).
7) Power up the router and allow it to fully boot (1-2 minutes).
8) Power up the computer (if the computer has a wireless card, make sure it is off).
9) Try to ping the router. To do this, click the "Start" button > All Programs > Accessories > Command Prompt. A black DOS box will appear. Enter the following: "ping 192.168.1.1" (no quotes), and hit the Enter key. You will see 3 or 4 lines that start either with "Reply from ... " or "Request timed out." If you see "Reply from ...", your computer has found your router.
10) Open your browser and point it to 192.168.1.1. This will take you to your router's login page. Leave the user name blank, and in the password field, enter "admin" (with no quotes). This will take you to your router setup page. Note the version number of your firmware (usually listed near upper right corner of screen). Exit your browser.
If you get this far without problems, try the setup disk (or setup the router manually, if you prefer), and see if you can get your router setup and working.
If you cannot get "Reply from ..." in step 9 above, your router is likely dead. Report back with this problem
If you get a reply in step 9, but cannot complete step 10, then either your router is dead or the firmware is corrupt. Report back with this problem.
If you need additional help, please state your ISP, the make and model of your modem, your router's firmware version, and the results of steps 9 and 10. Also, if you get any error messages, copy them exactly and report back.
Please let me know how things turn out for you.

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