Windows 2003 R2 how can I create a group to have full right only for the files and folders they create, and not have rights to delete anyone elses files/folders?

If your creating a network share, then this article details the steps necessary to achieve your goal: Permissions on a file server http://technet.microsoft.com/en-us/library/cc780823%28WS.10%29.aspx The Folder type section labeled "Drop Folder" should contain the information your looking for.

1. Create an appropriate group either in Local Users and Groups -> Groups or in Active Directory Users and Computers. Assign user accounts to that group. 2. Right-click the required folder -> Properties -> Security and remove permission inheritance in Advanced, then click Copy and Ok. 3. Assign the following permissions to that folder: Administrators and SYSTEM: Full Control, RequredGroup: Read&Execute + ListFolderContents + Read + Write, CREATOR/OWNER: Modify. This will make users able to create their own subfolders and files and have an appropriate access level to their own resources; but only Read access to other's files and folders.MCITP: Enterprise Administrator; MCT; Microsoft Security Trusted Advisor; CCNA