my EndNote is awfully slow to do any task

I would like to know if someone could help me to find out why my EndNote v7.4 is too slow. It used to be fast, but recently I do not know why, it is taking a long time in any task I try to do with it. Maybe is something in the configuration, but I still have not found out. 

Thanks in advance. 

on new documents or just older documents?  

if new documents too.  Have you recently installed a lot of output styles? (remove some from your local folder or from your installation styles folder).  Turn off hyperlinking in long documents.  Try working with CWYW of (instant formating off).  

If only some documents.  Unformat the document - clean up any corrupted fields  (instructions here: http://endnote.com/kb/81143)