The E81 error is dashboard related. To fix this, you can go onto the Xbox website, download the dashboard firmware yourself, put it on a dvd or USB and it will download the firmware again.
You could try deleting all system cache, to do this, go to memory in settings, press y and select the option to delete all system cache.
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Microsoft has to fix it it's internal
no they will not.I reccoment to you to use an online Xbox 360 fix gude. these Xbox 360 fix guides, there are easy to understand with step-by-step videos. (see link below)
To correctly fix a wireless xbox 360 controller simply refer to the service and user manual.
you call up the xbox company and talk to them and they help you fix it and if it needs to be fixed by a mechanic or electrian or somebody that fixes the xbox and for free i think. OR... You go to www.xboxlive.com sign in and accept their new Terms and Conditions, then you can recover your gamer tag.
bring it to where you bought it and ask them to fix it or just buy another one btw xbox's stink get a ps3