Acrobat slow to start (Outlook)

Hi , this is not a question about Craches , but my Acrobat is suddenly very slow to start when I want to look at an attached file in mails on Outlook , I have tried both the new version and old version of outlook but its the same , very frustrating to have to wait for up till a minute before the file can be seen , I have tried to repair the installation of acrobat , but its still the same ...suggestions on what to do ??  It has worked perfectly before , it started a couple of weeks ago.