Well, yes and no. Maybe.
Before we get into that, insert the standard editing registry = bad, might blow up computer, own risk, etc etc etc. If your not familiar with that line, don't even think about trying this.
The AutoShareWks value does nothing on W2K, and I would assume the same applies to XP, but not sure. It was an NT thing. The value you need to work with is
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters\AutoShareServer as REG_DWORD = O
That is a number 0 not uppercase o.
Both keys are required for NT, but the Wks key was eliminated. W2K and XP do not have the AutoShareServer these entries by default, so you will probably have to add them (as opposed to changing a value that is already there.) If I remeber correctly, you have to delete the default shares manually, they don't go away, but I'm not sure. I do know that the registry change does not delete the shares, it just keeps them from being recreated.
Another path on the same subject, I don't think it is a real good idea to do this as some software depends upon the shares being there. I would think that it would be much better to revoke the administrative rights for all your users. That is a good idea in general, anyway. I don't even log onto my own machine with admin rights unless I really have to. Keeps me from doing stupid stuff without knowing I'm doing stupid stuff. Best to be informed.