By the way, I've deleted a reply from your thread. It was a nonsense reply from a new poster which didn't address your issue. Sorry about that.
Your issue. I've seen this before, especially with .doc files. Firstly though since this is a corporate network you will need to talk about the problem to your own IT Tech about it as we can't interfere with their responsibilities or offer any options that might contravene their processes and procedures. My apologies, but businesses would be very unhappy with CNET if we did that.
That said, with Word .doc files I have seen where the "Open File" dialog fails, or takes a long time to respond, where the drive on which the document is located is 'mapped' to some other computer and that computer is off or busy.
That might be an avenue for your IT Dept to consider, but that is all that can be offered.
I am running XPsp3 on a corporate network, I have a PC which when you open a particular .doc file, it takes around 3 to 5 minutes to open, whereas it opens immediately on other machines.
Other files on the local drive and network drives open normally, just some files open very slowly, I have copied a template file to the local template folder but this hasn't helped.
Windows is updated, everything else works OK, what else can I check?