|You have to decide if you want to share the entire drive or just a folder or two. I would recommend putting at least one folder on the drive, right click on it and select properties, Sharing Tab, and share this folder. Then you need to designate a user or users and their read/write rights. |
If you want to share an entire drive, I would recommend shrinking the current partition and creating a new partition on the drive, formatting it, and making that entire partition share (similar procedure as for the folder in My Computer) for just that 'drive'.
About the only difference is that to create additional folders with the top one you would have to go back to the Vista machine or put them into a single primary folder that is shared.
The reason I would not recommend making the entire drive shared is to protect the integrity of the system, system files, and other things that might be deleted that are important.
You have to be a little bit crazy to keep you from going insane.