Question about HP Pavilion dv6000z Notebook

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Error 1721 I am having the same problem... I have windows vista, and trying to install my HP critical updates... when I do I get the Error 1721 and it will not install updates. I did try to do updates straight from HP website and it did not work...even tried re-installation of windows installer 4.5, but that did not work... I am lost on what to do.... any help is appreciated.

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What Is Error 1721? This is an error commonly witnessed when you try to uninstall a program using the "Add or Remove Programs" in Microsoft Windows XP. The message itself will read: "Error 1721. There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personal or package vendor."
Resolution #1: Reregistering the Windows Installer service It is known that if the Microsoft installation engine malfunctions or is internally corrupted, there is a possibly that you will not be able to remove programs that you used the Windows Installer, the service that administers the installation and configuration of programs, to install with. Thus, in the case of error 1721, it is necessary to unregister and then reregister the Windows Installer service to fix the corrupted parts of the engine. This can be accomplished through the Safe Mode by:

  1. Enter your computer in Safe Mode by:
    • Restarting the computer and pressing F8 after the BIOS information is shown
    • Select Safe Mode and Enter
    • Select your computer and Enter
  2. Log on as the local administrator
  3. Open up the command prompt by clicking Start, Run, and then typing cmd.exe and Ok
  4. At the command prompt, first unregister the service by typing msiexec /unregister and then hitting Enter
  5. Reregister the service by typing msiexec /regserver and then hitting Enter
  6. Type Exit to exit the command prompt safely
  7. Try to remove the program once again using Add or Remove Programs
I hope this helps you out. Thanks

Posted on Sep 04, 2008

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Here's the solution. I had to replace a failed hard drive in a Vista laptop. The original drive was a 200GB and I replaced it with a 500GB. I used my original Toshiba restoration CDs. I've spent HOURS troubleshooting this problem and I never would have guessed the solution -- it's the Intel Rapid Storage Technology Driver. It has to be updated because of the larger drive.
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If you’re using the built-in Vista Firewall, keep reading.

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That has been a problem with Vista since day 1.
If you want your sound back, you should go back to XP.
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And most likely a conflict with your ActiveX controls...

Try This....
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This update download apparently has patches for the exact error you have and that is a typical Vista "hiccup" error....

try that, if it doesnt help still, we can go from there..

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