Vegas Movie Studio Platinum 11 Error

[SnoopyDog]

I recently changed the options of rendering in sony vegas platinum 11, I was ussualy rendering 1080p classical settings, but even if it was 1080p the quality wasnt how i expected, so i decided to change it 720p but with a better quality, here is the tutorial vid I followed:http://www.youtube.com/watch?v=Z8Pc8...5&feature=plcp

Before this all the rendering was fine but after i changed these options in getting a error:
''Cant write file to disk, make sure you have enough space or the permission to write disk"
Im not so sure if this was the error, because i didnt had it now on my screen, but it was verry similar.
I have opened Sony Vegas as administrator and render the file in local disk E, where i have more than 50 GB free.

I coudnt find my error on internet, all I found is Sony Vegas Pro problems and tutorials, so this made me think that not so many people use Platinum 11 Version.
P.S: I used the EU options in the tutorial because im from EU.
I just cant undestand whats the contact between the error and the changed settings.