Problems with sharing

Hi, 

I'm Building a Windows 2008 R2 Enterprise server for a schoolproject. 

And i have problems with making the shares work.
I've used the share and Storage Managment to share the folders. 

But with the testing of the share somethings gone wrong.
I can open the folders and documents but i can't create of modify new data. 

My share permissions are Change and Read. 
My permissions in the acces controle list are : List folders content, Read and Write. 

I've tried the change the settings and sharing over and over again. 
But i can't get set in the right way. 

I'm Building the server with VMware Workstation 8

So Helpp!!