>I have a problem with a installation of NT 4.0 and SP6a. The drives do not have their default shares (i.e. C$ and D$). When you right click on the drives or any subfolders, the Sharing... menu option is not available nore is it in the properties page. The drive is formatted with NTFS.
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>Is there anything I can do (short of reformatting the drive) to re-activate the sharing?

The admin shares are present but hidden; only administrative accounts have rights to them, and they must be explicitly used; since any sharename that ends in a "$" is hidden, only NET USE, the Wscript.Network object, and API calls, can access these shares - they are invisible to explorer.