uploading files using ASP.net and it is on the domain

Hi,

I searched the forums for this answer and can't find it. I have a two part question: it involves WIN server 2003

I am using ASP.NET to upload pdf from a webform. This works fine with I configure localmachine\ASPNET to have permissions (Not joined to domain). But when I join it to the domain, I can't upload files anymore. I searched Microsoft's mdnaa but can't find the answer. I saw it said that I have to edit the web.config file to say i'm this person on my domain. I already tried that and it doesn't work.

I know in 2000 you can mount Drive D,E,F as virtual directories/subwebs. I tried in 2003 but it doesn't work. I want one drive to be the presentation drive and the other drive to be a test drive. I can only have ONE website. If you can give any clues or hints on how to do it, i would appreciate it.