Cannot connect to shared folders

Hi all,
I have installed a Windows Server 2008 on my HPProL server. I have built a test environment. I have installed ADDS and other necessary services. I'm running a test Windows 7 client. The network has no errors (I have checked the configurations). However, when I try to create a file inside a Shared Folder I am unable to do so. Even as a domain admin I cannot create them. I have setup NTFS permissions too. But still I cannot create files inside a shared folder.
Is there a permission problem?
Regards,
Larry
