Free Software To Mount .iso File Help Me..need To Use This Urgently..?

Help me..need to use this urgently..? - free software to mount .iso file

The purchase of an instant-messaging software (Windows 7) on the net .. But the problem is, the sent me an ISO file .. I was told to go and burn to DVD .. But the problem is hw can I create a bootable floppy disk? I do not know how KNW .. and do what the software needed? free software to do? Help me ok .. I need it urgently ..