Here's what you hafta do......
1. Get on the Win2k machine
2. Add a new user, give whatever permissions you would like, but don't make a password.
3. Put the user in whatever group you want.
4. Go to the Windows 98 Machine
5. Go to Control Panel
6. Go to Network
7. Choose Client For Microsoft Networking
it will ask you to reboot, go ahead and do so
8. When it boots up, you should have a screen that says Log On As: and Password:
9. For the username, put in whatever name thats on the Win2k account you created. Leave the password blank.
10. Login to the computer, you should now be able to share.