What is Windows Error Code 1601? The Windows Installer service could not be accessed. Contact your support ...
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Running into Windows Error code 1601 can slow up your day. Searching out this guide will help you take care of the problem once and for all.

The Problem

Whil installing a Microsoft Office update, this error may occur because the Windows Installer service could not be accessed. The log file for this error message is similar to the following: Applying patches to product {90280409-6000-11D3-8CFE-0050048383C9}; Microsoft Office XP Professional with FrontPage; Applying patch C:\DOCUME~1\branber\LOCALS~1\Temp\IXP001.TMP\OUTLOOK.msp Command line: PATCH="C:\DOCUME~1\branber\LOCALS~1\Temp\IXP001.TMP\OUTLOOK.msp"
REBOOT=ReallySuppress The update ended with status code: 1601. Finished processing the update on 6/28/2010 at 10:42:26. Encountered error 1601 while updating.

Solution

To resolve this problem, shut down the Windows Installer service and then re-register it. This makes sure that the Windows Installer engine functions properly. To do this, follow these steps: Click Start, and then click Run. In the Open box, type msiexec /unreg, and then click OK. When this process is complete, click Start, and then click Run. In the Open box, type msiexec /regserver, and then click OK. When this process is complete, reinstall the update.

TipFor more information, please see: How to fix Update error #1601


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