KB Article: http://support.microsoft.com/kb/826282

INTRODUCTION

When you try to open a Microsoft Management Console snap-in that involves security policies (such as Local Security Policy, Group Policy, or Domain Security Policy), the console may not open, and you may receive an error message similar to one of the following error messages:

Error message 1

Snap-in failed to initialize.

Name: Group Policy

CLSID: {8FC0B734-A0E1-11D1-A7D3-0000F87571-E3}

Error message 2

Snap-in failed to initialize.

Name: Resultant Set of Policy

CLSID:{6DC3804B-7212-458D-ADB0-9A07E2AE1FA2}

Error message 3

Snap-in failed to initialize.

Name: Software Installation (Computers)

CLSID:{942A8E4F-A261-11D1-A760-00C04FB9603F}

Error message 4

Snap-in failed to initialize.

Name: <unknown>

CLSID:{8FC0B734-A0E1-11D1-A7D3-0000F87571E3}