I have the tom tome go 720 and there is a circle with an X on it

You may be able to get "free" map updates from (illegal) underground sources. But that's not recommended.
Yes, you're right, you can simply get a new TomTom GPS and get the latest map(s) for it. Consider getting a TomTom with lifetime maps ....and you won't have to pay for any map updates.

I found I had two problems. 1) I had to download Tom Tom home for MAC on a different link 2) I found the solution in FAQ in Tom Tom solutions,open Tom Tome Home (which I had by then downloaded correctly) and click UPDATE AND INSTALL

Have you installed an expansion memory card in the 720? Sometimes it wont let you download music because you have filled up the internal memory. You need to put music on to the separate expansion card. BUT... when connecting to the computer to update map corrections and software, if you have not selected INTERNAL MEMORY when it connects, it won't be able to find the tom tom software, so it will just think you have another external USB hardrive attached. SO... take the expansion card out of the tom tom, then connect the tom tom to the computer in the normal way - Voila, suddenly it now sees the tom tom and you can update software. But do not download any more music to the internal memory. Ultimately you will have to format the EXTERNAL expansion card to clear it of any tom tom software updates, then download ONLY MUSIC to the external card. Do not hit Update My Tom Tom while connected to the external card - only do this when connected to the internal memory.

If you only just bought it NEW then you should use your "latest map" guarantee that comes with tom toms.

Showing speed options is set from the preferences and safety option

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if you are refferring to the promotion code that appears in the tom tom home software that is no longer used it was to help with the map guarntee but that has been changed

http://www.tomtom.com/support/index.php?Language=1&query=connect+to+home&FID=7375

Ah, another case of the Red X. No worries, it can be fixed. Most likely your connection was interrupted during an installation or removal of software features. Follow this guide to get your TomTom back up and running.

my opinion is downloading was not successful again download

Hi, I am back, just got the problem solved, I called their tech support at no charge (866-486-6866, Glen) , really good service.
First turn your firewall off (if you have one). You need to go into your 720 with the TomTom Home software and erase the downloaded software (with the remove items from my device) and reset the device (little reset button under the unit keep it pressed for 5 seconds), place it back in the cradle and restart your computer and than restart the 720 , bring the TomTom Home program up, and when the TomTom Home software in your computer restarts and detects the 720 it will tell you that you need to update the application, if it doesn't than you force the update by going to the add maps option, select items on my computer, select applications and press the add button, when done, go back and to device (option in top of your screen) and select disconnect device, restart your 720 and it should be back to life with the upgraded software.
Hope this helps
Aldo