On the desktop, right click on the drive or folder that you want to share with the laptop. Choose 'Sharing and Security' from the shortcut menu.
Click the link to share the drive.
Click on permissions.
Book breaks down a little here - I'm working on an office PC, not home, so your options may be different than mine.
Book says 'Select the Share This Folder on the Network option.'
Then it says to 'Enter a name for the share."
Then 'Select the Allow Netowrk Users to Change My Files option.'
Click OK.
Basically, you have to tell the desktop that it's OK to share specific drives and/or folders. All subfolders within a drive will be shared similarly.
Further on in the chapter, there's a tip about sharing - you can't share Documents and Settings, Program Files, or Windows folders.
Which leads me to believe that you can't share an entire computer, just specific drives and/or folders.
Hope this helps.
I will read more. ANY problem can be solved, if you try hard enough. Any.
