Hi Bus
You could look at Citrix GoTo Meeting, if you wish to make it more interactive, e.g. to let your clients use seimple highlighting and other tools to work with you.
It isn't free, but it is very good and if you are doing it regularly, the cost of about 450$ will soon pay back.
You can share your screen (and thus deliver the PPT shpw), whilst connecting voice via VOIP. Personally, I use Skype rather than the built in function, but that's from habit
