Question about Microsoft Windows Vista Ultimate Edition

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Error 1721 Trying to install a VPN that is made specifically for Vista (and works on one of my other computers running Vista) but I get the error 1721 message. I've already run the msiexec/unregister and regserver commands. What next? Chilly

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  • mohammed shaik Aug 15, 2008

    hi ,

    I am trying to vpn client 5.0 version, in 64 bit windows vista machine...I was getting 1721 error ..can any one please help me out


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This page applys to XP,

but the solution should be similar. If you've done the registering, the next suspect would be something corrupt in your VPN package.

Try a fresh download or copy of it, and be sure you run as administrator during the install.

Posted on Jul 18, 2008

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I am trying to uninstall Cisco VPN and I get the windows installer error 1721, does anyone have any ideas on how to resolve this? thanks.

To resolvethis issue, perform the steps in the "Reregister the Windows Installer service" section. If youexperience the issue after you perform these steps, you may also have toperform the steps in the "Run System File Checker" section. Reregisterthe Windows Installer service loadTOCNode(2, 'resolution');The Windows Installer service manages the installation and removal ofprograms. The service applies a set of centrally defined setup rules during theinstallation process. These setup rules define the installation andconfiguration of the installed program. Windows Installer uses the Microsoftinstallation engine to install or remove programs. If the registration of theMicrosoft installation engine is corrupted, you may not be able to removeprograms that you have installed by using Windows Installer. In that case, youhave to unregister and reregister the Windows Installer service. To do this,follow these steps: Windows Installer
  1. Start your computer in Safe mode. To do this, follow these steps:
    1. Restart the computer.
    2. After the BIOS information is displayed, press F8.
    3. Use the DOWN ARROW key to select Safe Mode, and then press ENTER.
    4. Use the UP ARROW key and the DOWN ARROW key to select your computer, and then press ENTER.
  1. Log on to the computer as local administrator.
  2. Click Start, click Run, type cmd.exe, and then click OK.
  3. At the command prompt, type msiexec /unregister , and then press ENTER.
  4. At the command prompt, type msiexec /regserver, and then press ENTER.
  5. At the command prompt, type exit, and then press ENTER to close the command prompt.
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Jan 10, 2011 | Computers & Internet

1 Answer

Hi, when i try to install cisco vpn on my xp machine, it is throwing 1721 error.

Cisco VPN Client for Windows Vista, release, does not support the following:

blank.gifMicrosoft Windows NT, 98, and ME.

blank.gifSystem upgraded from Windows XP or earlier Windows operating systems to Vista. (Clean OS installation required.)

blank.gifCombination of Cisco Unified Video Advantage 2.1.2 and McAfee HIPS Patch 4 Build 688. To avoid system failures, uninstall either of these two applications, upgrade McAfee to the latest version, or use VPN Client 4.6.x.

blank.gifStart Before Logon.

blank.gifSmartCard authentication.

blank.gifIntegrated firewall


blank.gifAuto Update.

blank.gifTranslated Online Help. Online Help is provided only in English.

blank.gif64-bit Windows operating systems. For x-64 support, customers should explore with their Cisco sales representative the use of the next-generation Cisco AnyConnect VPN Client.

Nov 04, 2010 | Microsoft Windows XP Professional

1 Answer

I'm trying to install the Cisco VPN client to a Windows 7 (32bit) computer but keep getting a Windows Installer 1721 error. Any advice is much appreciated.

Dear User ,
Follow the Steps below to resolve your problem
1. Click on start and the search bar right next to it , type Cmd 2.As the CMD appears in the search list . Right click on that and Click on Run As Administrator
  1. At the command prompt, type msiexec /unregister , and then press ENTER.
  2. At the command prompt, type msiexec /regserver, and then press ENTER.
  3. At the command prompt, type exit, and then press ENTER to close the command prompt
Try to install it again ,Just in case it fails ,follow the steps below 1.Right click on the VPN setup file and click on Run as admin
Good luck
Thanks and regards Aboobacker S

Sep 28, 2010 | Computers & Internet

1 Answer

When installing Java, at the end the message ''Error 1721. There is a problem with this windows Installer package''. A program required for this install to complete could not run. I've tried everything....

Try the steps laid out in this MS KB article about the installer service:

Reboot the computer, after it beeps start pushing F8. You should get a menu. Select Safe Mode and push enter.

Once Windows comes up click start and type in CMD (for Vista/7). Right-click cmd.exe and select "Run As Administrator". (For XP: click start then Run. Put in CMD and click OK).
Put in
msiexec /unregister

Then bring up the Run box again and put in
msiexec /register
Close the CMD box and reboot the PC, letting it boot as normal. Try the Java install process again. If it still doesn't work try the SFC command listed in the above KB article (which I can help with).

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Download the latest version of the Cisco VPN Client. My version is

You can also try using the Microsoft "MSIZap" utility to ensure a clean uninstall. It is a command-line utility. You will need the original MSI install file from the Cisco VPN client to use MSIZap.

You can download it here:

Sep 22, 2008 | Microsoft Windows Vista Ultimate Edition

1 Answer

Error 1721

Okay, lets begin. First off you were trying to install .msi packages? Second how new is the computer? Third how much stuff do you have on the computer? Finally forth Have you had any spyware/ viruses? I need this information to continue troubleshooting.


Aug 31, 2008 | Microsoft Windows XP Professional With...

1 Answer

Error 1721

Try the following regardless of the software as this is the common error message provided by Microsoft. Of course this won't rule out either a corrupt installer or incompatibility's
  1. Disable/Configure any anti-spyware or anti-virus software on your system during installation process. For example: Spybot Search and Destroy Program or Norton Anti-Virus
  2. Check to see if any spyware or adware is installed on your system blocking the completion of install process.
  3. Check to see if you find any unwanted entry in Add/Remove Programs or Internet Explorer - Add/On's section (Tools - Internet Options - Programs -> Manage Add On's). If you found one, remove/disable this entry.
  4. On Windows Vista, disable UAC (User Access Control) feature for your account

Aug 27, 2008 | Microsoft Windows Vista Ultimate Edition

1 Answer

Error 1721 vista

I'm not sure if Vodafone is compatible with Vista. I thought it was only compatible with OS's up to XP. I'm not 100% sure though, maybe you just need a driver of some sort.

Mar 29, 2008 | Microsoft Windows Vista Ultimate Edition

2 Answers

Download problems

have you tried right clicking on the install icon and running it as administration?
With all new installed files that dont run as normal try running them as administration.
Hope this helps.
If not please post the exact error message that comes up when you click run.

Dec 12, 2007 | Microsoft Windows Vista Ultimate Edition

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