IIS folder permissions for uploading images



I want to allows an administrator to login and upload images by submitting a form. This works with php on unix server but now im working on Windows server. What permissions should I set on the 'images' folder in order to allow file uploads.
I am getting an error at the moment:

move_upload_file ...... permission denied......

Using Windows server is the only option available
The PHP process on WinServ/IIS is listed as owned by a public account. You must make sure that account has access.
Got the answer.
Write permissions should be set for the IUSR for the images folder to allow easy uploading of images.
My ISP weren't happy with the security of this so I uploaded the images to the database in BLOB (binary) format and downloaded them when needed.