When you attempt to install 819696 MS03-030: Unchecked buffer in DirectX could enable system compromise, Windows 2000 hangs. You may also receive:

                              *** Fatal System Error: 0xc000026c                              (0xE134FF68,0xC0000022,0x00000000,0x00000000)                              STOP: c000026c \{Unable to Load Device Driver\}                              \SystemRoot\system32\drivers\portcls.sys device driver could not be loaded.                              Error Status was 0xc0000022                              Break instruction exception - code 80000003 (first chance)                              A fatal system error has occurred.                              Debugger entered on first try; Bugcheck callbacks have not been invoked.                              A fatal system error has occurred.
This behavior will occur if files in the system's %TEMP% folder have been encrypted by using the Encrypting File System (EFS).

To fix this problem:

1. Start / Run / %TEMP% / OK.

2. Use the View menu to Go To and press Up One Level.

3. Right-click the Temp folder and press Properties.

4. Press the Advanced button.

5. Clear the Encrypt contents to secure data box.

6. Press OK,  and OK.

7. If you receive a Confirm Attribute Changes dialog, select Apply changes to this folder, subfolders and files.

8. Press OK.