problem with embedded pdf file
 

Morning,
i have a user that is trying to open an embedded pdf file within an excel
file. when he tries it returns this error:
Cannot start the source application for this object.

he can open the embedded excel and word files okay, it's just the pdf. he
has adobe reader 6 and is using windows xp, office xp.
I can open pdf files stored on his hard drive okay and i can open the adobe
reader program okay, so it seems it's only with embedded pdf files

he says that another person in the branch can open the embedded pdf files
okay.

Any suggestions?
Thanks in advance