New Post: Minimum security permissions under windows for a new site

I've tried several times with no succes creating a new site, and I always find the same obstacle: I don't know the correct windows accounts to run the composite site.

Only works with everyone with full permissions, but I know this is not acceptable.

These are the main accounts of the directory tree and its rights:

• System ->Full
• Network Service -> Modify - Read & Execute , etc
• Users -> Read & Execute, etc
• IIS_IUSERS -> Read & Execute, etc
  

What else is needed?
Thanks
Raúl