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Have you had problems getting AllShare to work on your Galaxy S phone? Unfortunately it’s not just a matter of right clicking and clicking “share” and there aren’t any good sources available on the web for this either, hence this guide was necessary. So let’s get started shall we? Oh, this guide is intended for Windows 7 users only.
The secret ingredient to this whole process is Windows Media Player. (You can click any of these screen shots for full-size versions)
I’m using version 12 of WMP, so I’m going to assume you’re a good little computer user and you keep your software up-to-date as well 
Anyway, once you have WMP open, you need to view your Library. If WMP doesn’t take you there by default, just press CTRL+1 and it will take you there.
Now that you’re in your library, you need to right click on whatever type of media you want to be able to browse on your phone (I’m choosing Videos for this example) and then click Manage Videos Library.
You will then be greeted with the Videos Library Locations box.
At this point, just click Add, point it to whatever folder you would like to be shared to AllShare, and then click Include Folder. Once you do that, you will be brought back to the Videos Library Locations box, at which point you should see your new folder that you just shared.
That’s it! You will now be able to stream videos (and whatever other media type you add the same way in WMP) to your AllShare-equipped Galaxy S device! Pretty simple eh?