Check your event logs for the following entry.
Event Type: Information
Event Source: Windows File Protection
Event Category: None
Event ID: 64033
Date: <OMITTED>
Time: <OMITTED>
User: N/A
Computer: <OMITTED>
Description:
Windows File Protection could not be initialized. The specific error code
is 0xc000000f.
If you see this error, check the local computer certificate store to see if
the Trusted Root Certificates have been deleted or corrupted. These steps
would be...
1) Logon to the workstation with local administrator privileges
2) Select Start | Run
3) Type: MMC
4) OK button
5) Select File | Add/Remove Snap-in
6) Select Add button
7) Pick Certificates
8) Select Computer Account > Next
9) Select Local Computer > Finish
10) Select Close/OK to return to console window
11) Expand Trusted Root Certificate Authorities
Question: Is there a "Certificates" folder under Trusted Root Certificate
Authorities? If yes, continue. If no, then you can stop at this point
because the PKI environment is compromised at this point.
12) Select Certificates folder
13) Do the following "Issued To" certificates exist?
Copyright(c) 1997 Microsoft Corp., Expire: 12-30-1999 Purpose: Time
stamping
Microsoft Authenticode(tm) Root Authority, Expire: 12-31-1999 Purpose:
Secure Email, Code Signing
Microsoft Root Authority, Expire: 12-31-2020 Purpose: ALL
NO LIABILITY ACCEPTED, (c) 97 Verisign Inc., Expire: 1-7-2004 Purpose: Time
Stamping
Verisign Commercial Software Publishers CA, Expire: 1-7-2004 Purpose: Secure
Email, Code Signing
Thawte Timestamping CA, Expire: 12-31-2020 Purpose: Time Stamping
Just so you know, Windows 2000 PKI environment consists of 108 certificates.
The 6 above are core to the operating of Microsoft Windows. While you can
restore them from another machine, you might choose to reinstall because the
other certificates is what helps with "HTTPS" and getting just about any
data encrypted/unecrypted.