I think you should have your own conferencing system. Web conferencing could prove an important business tool for you. In fact, you could invite a group of people to a virtual conference room to collaborate in real time, share applications, chat and do other things when face-to-face is not feasible.
You can get your own web conferencing system from RHUB Communications.
In addition to web conferencing, you can get several other features such as file transfer and PC remote control. If you want your audience to only view your presentation (and not participate) they don't have to download anything and can view your presentation in any web browser. I've used other web conferencing tools and have been limited in which browser - Microsoft Internet Explorer or Firefox -I could use.
Hope this will solve your problem. Best of luck!