PowerPoint has an option to display the presentation on one monitor and the notes on the other: look for the "show on" option. More recent versions (2002 on) also have "presenter view".
I don't have a Dell, but Fn-F8 probably cycles through your display options: lcd only, lcd + external, external only. You may need to "extend" the desktop rather than just duplicate it: use Fn-F8 to get both displays working. Then do something like start - control panel - displays - settings. You should now see a panel showing two displays, 1 and 2. You can drag the displays around, and a drop-down box underneath shows you which display is your LCD, and which is your external display (in your case, the projector).
Near the bottom of the panel there will be an empty tickbox with "extend my windows desktop onto this monitor". Tick the box. This will change the settings from simply duplicating the display to one large desktop.Again, I don't know if you have to do this to get Powerpoint to display on the external monitor, it's about 6 years since I did this and my memory has had a few bits flipped over the years.
OK, check this out:
http://office.microsoft.com/en-gb/po...565471033.aspx