Another uestion about Windows 2000 config..

I just checked the Microsoft Base Line Security Analyzer again, and it said I have 2 shares, here are the details:
2 share(s) are present on your computer.
Result Details

Access: F - Full, R - Read, W - Write, D - Delete, X - Execute, C - Change
Score Share Directory Share ACL Directory ACL
ADMIN$ C:\WINNT Admin Share BUILTIN\Users - RX, BUILTIN\Power Users - RWXD, BUILTIN\Administrators - F, NT AUTHORITY\SYSTEM - F, Everyone - RX
C$ C:\ Admin Share Everyone - F

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Is this safe to have? If not, can I disable them without messing the system up?