Problem streaming videos on my 360

[Max-Powers]

I have my HTPC with all my videos on an external hard drive hooked up to the HTPC. I have windows 7. I want my 360 to be able to use media browser, or WMC just like my computer. I set it up, but when I go to media browser, it freezes and doesn't do anything. How do I properly set this up? Also, when I go to video library under my xbox, and navigate to my computer, it only has like 3 folders, and I can't go to my external drive. I set up other folders to share, but it still doesn;t see them. How do I see other folders?