To everyone who have provided me with a range of tips to try to sort out this problem, thanking you all very much. Your support has been appreciated.

I went surfing on the net over the past few hours, and believe that I have finallyfound the solution to this problem. I visited a page on the net:

    http://vintageware.orcon.net.nz/warcraft 2/

and found the following message:

     It doesn't work on Mac OS X!
The original version of Warcraft II has an incompatibility with Mac OS X, where it can't find the game CD-ROM. You can join in a network game since up to three players can join using one CD-ROM, but you can't start a game. The only way to fix this is to upgrade to the
      newer Battle,net version of Warcraft II.

Now the next chapter in this saga,will see me searching high and low for a retailer who may still have a copy of this game in stock still.

Again, thanx for your support.

Regards
Rosie :-)