Can’t attach documents in Outlook 2000

I have 200 computers running Win2K SP3 on a Win2K only domain. They are connected to an Exchange 2000 server. 2 machines hang when attempting to attach documents from a particular share on the network. As soon as the machine browses to this share, Outlook hangs and needs to be killed and restarted. The other 198 machines are OK.

Any ideas