XBox Love - how do I remove?

[Punky]

Hey there.
Something happened with my XBox live - it screwed up my xbox factory load and now I can only boot in EVO (so no live playing with original games).
I've lost the orginal backup of my Xbox when it was chipped - so now I am hoping to somehow put things back the way they were manually.
Can anyone offer me advice?
Hell - I'd lvoe to just delete XboxLive and do it from scratch if need be.