Thank-you Stanley Beamish.
I do have My Network Places in the left pane of my Start Menu. But I do not see Network Tasks here.
The OS on my PC is XP and to set up my network in the beginning I: On the PC, from the C drive, made a new folder, (New Downloads) Right Clicked on this folder, selected Sharing and Security, Network Sharing, Selected Share Folder on Network, Allow network users to Change my files, Apply and OK. On The Mac: Finder, Network, Click My Network, Double Click My computer, then OK ...... I have a couple of steps after that but this is where I am stuck as My Computer does not appear. I completed this set-up a few weeks ago and did transfer files once. Now I am trying to do it again but the connection seems to have disappeared.
I am trying to follow your kind instructions but cannot proceed as I cannot locate Network Tasks, I tried searching for network tasks...... but I get links to my internet connections etc., not what I am looking for. I will follow up with the links you sent me and see if I can solve this. Thank-you