Win 98 Group Policy and Office 2000

I have just set up and additional 18 computers on win98 running office 2k. They are connected to a server running win2k server. I have set up group policies and set them up the same as the existing clients. My problem is that 1 of the new machines works fine, while the others will not allow office to work. Gives a weird message about the destination file being moved or unaccessible.

Someone said this is a known problem with W98 GPs and Office 2K and there’s a registry hack that sorts it out. I can’t find reference to this so does anyone have any ideas?