insert pdf into excel

We have a few users in our office that are opening excel files through projectwise and then are trying to simply insert pdf's into the excel files and we run into 2 different problems.  All users are running office 2010 and the same version of projectwise explorer (v8i select series 4)(but this isn't really relevant).  On some machines it seems to work as it should but on others  it will act like it's loading the pdf into the file but it never shows up, or if you try to insert a pdf that isn't on projectwise you will get a continuous error saying that it is waiting for an OLE object.  The only way to get out of this is to end excel in the task manager.  There seems to be something wrong with the projectwise/office integration on these machines.  The error you get this way is "microsoft excel is waiting for another application to complete an OLE action".

Any help would be appreciated.