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Have you tried updating and/or reinstaller Windows Installer? It changes (updates) from time to time. Go to the Downloads section at Microsoft.com and see if you can find a new X64 XP version. That is what I would try first. <br />
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Also, have you scanned for malware as this is anohter cause of this. &nbsp;... Thinkpads_User<br />

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Have you tried updating and/or reinstaller Windows Installer? It changes (updates) from time to time. Go to the Downloads section at Microsoft.com and see if you can find a new X64 XP version. That is what I would try first.

Also, have you scanned for malware as this is anohter cause of this.  ... Thinkpads_User


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No, I have not ran a malware scan, did not think of that. I did run a sfc / scannow with the xp x64 dvd... I will try to reinstall the installer service and see what happens. 
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No, I have not ran a malware scan, did not think of that. I did run a sfc / scannow with the xp x64 dvd... I will try to reinstall the installer service and see what happens.

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I have a user who is using Windows XP X64 and his windows installer will not work properly. He is not able to uninstall any application. I have found a kb that asked me to start &gt;&nbsp;Run &gt;&nbsp;msiexec.exe /unregister than msiexec /regserver than reboot. This does not resolve his issue. He is receiving an error that the windows installer could not be accessed. I checked the reg permissions and they all seem to be fine, system has full control over H_K_C_R. <br />
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Thoughts?
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I have a user who is using Windows XP X64 and his windows installer will not work properly. He is not able to uninstall any application. I have found a kb that asked me to start > Run > msiexec.exe /unregister than msiexec /regserver than reboot. This does not resolve his issue. He is receiving an error that the windows installer could not be accessed. I checked the reg permissions and they all seem to be fine, system has full control over H_K_C_R. 

Thoughts?

Windows Installer Service could not be accessed

Installation is the act of making a computer program program ready for execution. Because the process varies programs often come with a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process. Cross platform installer builders that produce installers for Windows, Mac OS X and Linux include InstallAnywhere, InstallBuilder and Install4J. Installers for Microsoft Windows include Windows Installer, InstallShield, and Wise Installation Studio; free installer-authoring tools include NSIS, IzPack, Clickteam, InnoSetup, InstallSimple and WiX. Mac OS X includes Installer, and also includes a separate software updating application.

Installation

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.