This article was previously published under Q321736
If you start the Active Directory Users and Computers Microsoft Management Console (MMC) by clicking Start, clicking Programs, and then clicking Administrative Tools, your computer may stop responding.
If you can view the Processes tab in Windows Task Manager, Stupdate.exe appears to be using 100% of the CPU time. To open Task Manager, press CTRL+ALT+DELETE.
If you create a new Microsoft Management Console file by clicking Start, clicking Run, typing mmc, and you then add the Active Directory Users and Computer snap-in, your computer continues to function in a typical manner. If you save new management console file, and then reopen it, the computer again stops responding.
This issue may occur if your computer is running as the information server for Trend Micro's ServerProtect antivirus program.
To work around this issue, stop the antivirus software on your computer, and then open the Active Directory Users and Computers MMC.
To resolve this issue, contact Trend Micro for specific resolution information.
For information about how to contact Trend Micro, Inc., click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:
65416 Hardware and Software Third-Party Vendor Contact List, A-K
60781 Hardware and Software Third-Party Vendor Contact List, L-P
60782 Hardware and Software Third-Party Vendor Contact List, Q-Z
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.