updated from x3 to x4 now have MS word 10 but endnote will not insert in document

I have no idea why it will not insert into my word 10 document.

Any ideas?

I assume this refers to footnote citations with word 2010.  – there is a bug.  I think it works better with out of the box X4 without the update to 4.0.1, but even then - there are some footnote bugs.  Contact tech support, they might have a beta trial for the update to fix it?  see the notes for the X4.0.1 update here and a discussion of the bugs in this thread.  Seems they tried to fix one bug by making it impossible to insert the footnote in the first place!