I can’t use EndnoteX5 with my Word 2010 (32 bit version) because of “Invalid class string”. It was OK with EndNoteX1. Recently I upgraded to EndNoteX5 and since then word does not communicate with Endnote.
I have administrator permissions
I started EndNoteX5 and then Word (in right order)
I did everything what was suggested. A small problem was that permission settings in Windows 7 look differently than on picture (at least in my computer). Anyway, finally the message “invalid class string” changed to “the requested operation requires elevation”. So, I am also running word as administrator now and everything looks OK now. Thank you.