acer 4710 is already a vista ready, therefore installing xp sp2 needs hard work!!!
First, you have to change your BIOS version to xp sp2. you can do it by downloading ISO file(for 4710) from...
I think windows xp sp1 doesn't support webcam drivers, even the audio bus HD drivers. One of the computer technician told me that i should switch to xp sp2. my laptop is acer 4710 and i can now use the webcam.