When Windows Explorer generates the thumbnail image from the ASF file, the Dllhost.exe process consumes excessive CPU resources. This issue occurs because the index object in the ASF file is corrupted. To resolve this issue, install update rollup 2855336.

If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track. To do this, follow these steps: Open an elevated command prompt.

Dllhost.exe is the system-provided surrogate that is used by a COM DLL (in- process) server to run in its own separate process. When the default (machine-wide) authentication is set to None on Windows NT 4.0, an error occurs during the launching of Dllhost.exe and it terminates.

Fixes an issue in which a memory leak occurs in a Dllhost.exe process that hosts the MQSAgent2 COM+ application in BizTalk Server.

Examples of an IIS process are Inetinfo.exe, Dllhost.exe, and W3wp.exe. When high CPU usage by an IIS process occurs, you experience one or more of the following symptoms: A Web page does not load correctly. For example, the Web page is blank or does not respond. You experience slow performance on a server that is running IIS.

When an IIS process like Inetinfo.exe, Dllhost.exe, or W3wp.exe stops responding (hangs), you may experience any of the following symptoms: A Web page does not load correctly. For example, the Web page appears to be blank or stops responding.

Run Dcomcnfg.exe. If you are running Windows XP or Windows Server 2003, perform these additional steps: Click the Component Services node under Console Root .

Fixes an issue in which event 4673 is logged two times every minute in Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2.

The issue occurs because the Windows Photo Viewer uses the Microsoft COM+ hosting process (Dllhost.exe). This process is configured to allow only one instance of itself to run on each computer. Note This hotfix is only for Windows 7 and for Windows Server 2008 R2.

Microsoft is aware of new variants of the class of attack known as speculative execution side-channel vulnerabilities. The variants are named L1 Terminal Fault (L1TF) and Microarchitectural Data Sampling (MDS). An attacker who can successfully exploit L1TF or MDS may be able to read privileged data across trust boundaries.