I'm not sure why you're getting the BUA failed massage but try to go into settings and see if there are options you can check or uncheck that might fix it. I have never used it and never plan to so I don't know much about it.
If your phone is on ICS, then you can disable a lot of that bloatware by going into settings, apps then swipe to the far right screen to all apps. For each app you will be given the choice to uninstall, disable or it will be grayed out (if it is grayed out then it means it can't be either uninstalled or disabled). For some apps that you want to disable, you have to choose uninstall first to uninstall any app updates. Then you will need to select disable after the updates have uninstalled.
Unfortunately BUA is one of those bloatware apps that can't be disabled but NFL can be and many others.
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