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.NET 1.1 Installation Failure - error 0x66A

Windows Update

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Old 06-07-2005
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.NET 1.1 Installation Failure - error 0x66A

When I attempt to install the .NET recommended update, it returns error code
0x66A. Trying again has no effect. Any suggestions?

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Old 16-07-2005
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I get the same error code, so you are not alone with this problem
Hope someone can explain it

I'm having the same problem anyone figure it out yet ?
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Old 19-07-2005
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RE: .NET 1.1 Installation Failure - error 0x66A

Received an answer from MS Support, but haven't had time to try it yet. Here
it is and good luck!

Thank you for contacting Microsoft Windows Update Support. My name is Tony
and I am glad to work with you. You can contact me directly by writing an
email to v-30tont@mssupport.microsoft.com with the case ID in the subject

Based on my research, the issue can be caused that .Net Framework component
was damaged. Let us refer to the following steps to troubleshoot this issue:

NOTE: If you have Microsoft Visual Basic installed, please let me know
before trying the following steps.

Step 1: Download Microsoft Windows Installer CleanUp utility
1. Visit:
2. Save the file to your computer.
3. Install this tool on your computer.

Step 2: Remove .Net Framework
1. Click Start -> (All) Programs->Windows Installer Clean Up.
2. See if you can find .Net Framework software. If so, remove them.
3. Restart the computer and see if the problem still exists.

For more information, please refer to:
Title: Description of the Windows Installer CleanUp Utility
Link: <<http://support.microsoft.com/default.aspx?scid=kb;en-us;290301>>

If you cannot uninstall .NET Framework, please refer to the following
Article to remove it manually.


After that, please restart the computer and perform the following
suggestions to reinstall .Net framework and .Net framework 1.1 SP1

Step 3: Install .NET Framework 1.1 Redistributable Package and .Net
Framework 1.1 SP1
1. Please download the Microsoft .NET Framework Version 1.1 Redistributable
Package from the following link and save it to the C drive (C:\)

Microsoft .NET Framework Version 1.1 Redistributable Package

Microsoft .NET Framework 1.1 Service Pack 1

Security Update for Microsoft .NET Framework, Version 1.1 Service Pack 1

2. When the File download window appear, please click Save button, and then
local to a direction in Save as windows to download the Microsoft .Net
Framework 1.1 setup file in the local computer, and double-click the .Net
Framework file to manually install them one by one.

If you encountered a problem when installing .NET Framework 1.1, you can
refer to the following Microsoft Knowledge Base article:

How to troubleshoot Microsoft .NET Framework 1.1 installation issues

However, if the issue persists, please capture a screenshot when you
encounter an error message:
1) Press the Print Screen key (PrtScn) on your keyboard.
2) Click Start, click Run, type MSPAINT, and click OK.
3) In Paint, click Paste under the Edit menu, click Save under the File
menu, type a file name for the snap shot, choose JPEG as "Save as type", and
click Save.

4) Please send this file to the email account:

Thank you for your cooperation. Please try the steps shown above and let me
know the results at your earliest convenience. If you have any questions or
concerns regarding this issue, please don't hesitate to tell me. It is my
pleasure to be of assistance.
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Old 27-11-2005
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RE: .NET 1.1 Installation Failure - error 0x66A

Did anyone get a response for this if Visual Basic 6 is installed??

I was going to check with them but they won't support OEM XP installed
operating systems! :-(
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Old 13-05-2010
Join Date: May 2010
Posts: 1
Re: .NET 1.1 Installation Failure - error 0x66A

Applies to Windows XP.

Uninstall all .NET Framework programs in reverse order. Utilize add and remove programs from control panel to do this.
Delete all folders and files with the name KB974417. See Note 1 below.
Download and Install Microsoft XPS Viewer here: http://www.microsoft.com/whdc/xps/viewxps.mspx
During the install, .NET Framework 3 will be installed. After the install, a reboot is required. Do so.
Next, go to Microsoft update, download and install High Priority update(s).
After the install, a reboot is required. Do so.
Problem solved plus bonus program Microsoft XPS Viewer.

Note 1: Go to explore. Click on Tools, Folder Options, View.
Check radio button "Show hidden files and folders".
Uncheck "Hide protected operating system files (recommended)".

Personal recommendation: Always do a custom update, but only download and install "High Priority" and "Optional Hardware" updates.
Do not install "Optional Software" updates.

I have a minimum of 83 programs installed on my pc. All of them run perfectly well without ".NET Framework 1.1".
Maybe some programs require it, but I have not found one yet.
Please do not hesitate to correct me if you find I am wrong.

Last edited by tc32628 : 13-05-2010 at 08:44 PM. Reason: I am old and forgetful.
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