Umm dude not to be mean, but i already answered your question.
Just dual Boot so you can go to a live safe dash. I have a 160GB hard drive and what I did is just first got my live account and then modded the hole thing, then from the Unleash X dash I went to the MS dashbroad, placed my account on the xbox from the memory card; then when i was finish i dual booted to my Xbox to my Live safe dash and it logged in and started playing Halo 2 on Xbox live
But I'll answer your question any way cause where here to help
1.How to get xbox live safely
ans. Dual boot using Krayzie extras
using the extras go to dual boot, live safe dash and prest o
password if you use the extras is AYBX2. How to get your live account
ans.all you have to do is get the live account from the HD that had it, just got to your MS dash and go to the saves and it should be all the way at the bottom of the saves list and just put it on a memory card then just go to you modded HD if your using Unleash X chose MS dashboard and you should go back to the original MS dash and got to the memory card and transfer the save over to you HD like and other save on a memory card
Finally after all that turn off the xbox completely and then turn it on using the eject button, cause if you used the extras u should now boot up in to a live safe dash
3. I wanna play burn games
ans.you cant play burned game on an xbox or you will get banned. YOu have to use the Original disk sorry even if you have the exploited firmware on you drive