How can I see my phone screen from my pc, live? (phone is connected to that pc)
To be able to share your phone screen onto another device such as a PC you must have a Windows Phone device that is running an internal Microsoft build on the phone. Alternatively (and perhaps more likely) is that you would need a developer unlocked phone.
If you do manage to obtain a developer unlocked phone, you can use
Windows Phone Device Manager that provides you with
Capture Phone Screen functionality.
There is no way to project your actual device screen to any other device, including other phone or PC.
The possible overcomes are either to use an emulator (for demos, for example) or to use special cams with macro modus that would send the image live to your projector.
I have also had positive experience with a special overhead projector, that does not use the translumination for projection, but rather has a built-in camera: those projectors are used for showing scanned documents.
I use an IPEVO POV Camera. $70 or so. Available from Amazon - http://amzn.to/T7ify3 .
Works great with win8 and win7 both, and easily portable...