My computer just spat out and shattered a program disc at me and the disc is no longer usable

I had the fright of my life and we still don't know how the hell it happened

I've got ths pieces of the disc in front of me now and wondering how the hell we're going to find a replacement copy (as its quite old) and we need it for our business - EEK!!!!!!!

Any ideas anyone - is there a facility for ordering back issues of computer discs like you can with records/cds etc? If not we're, well, erm...... up the creek without a paddle