Windows update fails with error code 0x643

I am running XP- I am trying to update >> Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update for .NET versions 2.0 through 3.5 (KB951847) x86 - I am getting Error Code: 0x643 .

Found this error because I was trying to run the Win 7 Update advisor, and now I am locked into a loop of .net trys to update when shutdown of XP. And for the teck support that suggested I just update to win 7- That's not a option. I right now don't have a way to backup all my data. Besides that does not solve what wrong with the update.

Hi Okracoke19,

Welcome to Microsoft answers.

I would like to ask you few questions in order to get a better understanding of this issue.

·         Could you give me the complete error message or error code you get?

·         How are you trying to install the Service Pack on the computer?

First, I suggest that you run the System Update Readiness tool on the computer and install the service pack in clean boot:

Download and run the System Update Readiness tool (Checksur.exe). After you download this tool, it runs a one-time scan for inconsistencies that might prevent future servicing operations.

For more information about how to download and run the System Update Readiness tool, click the following article number to view the article in the Microsoft Knowledge Base: 947821 Description of the System Update Readiness Tool for Windows Vista and for Windows Server 2008 :http://support.microsoft.com/default.aspx/kb/947821

You may install the stand alone for the service pack from by keeping the computer in clean boot.

Windows Vista Service Pack 1 Five Language Standalone (KB936330)

http://www.microsoft.com/downloads/details.aspx?FamilyID=b0c7136d-5ebb-413b-89c9-cb3d06d12674&displaylang=en

Clean boot starts Windows by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.

Steps to perform clean boot and check if you have the issue.

1. Click Start, type msconfig in the Start Search box, and then press ENTER.

User Account Control permission: If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.

2. On the General tab, click Selective Startup.
3. Under Selective Startup, click to clear the Load Startup Items check box.
4. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.
5. Click OK.
6. When you are prompted, click Restart.
7. After the computer starts, check whether the problem is resolved.

Reset the computer to start as usual:

After you have finished troubleshooting, follow these steps to reset the computer to start as usual:

Click Start, type msconfig.exe in the Start Search box, and then press ENTER.

If you are prompted for an administrator password or for confirmation, type your password, or click Continue.

On the General tab, click the Normal Startup option, and then click OK.

When you are prompted to restart the computer, click Restart.

Refer the link for more information: How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows7:http://support.microsoft.com/kb/929135

Let me know if this worked.

Swathi B 

• Microsoft Support.

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I am instructed to 1st install service pack 1 on my Vista Home Premium desktop before I can install Windows 7 but I receive error 643 each time I try and the service pack 1 installation fails.

This is the Vista Install, Upgrade and Activate Forum.

You will get the best help for any Update/Service Pack problem in the Vista Update Forum; link below:

http://social.answers.microsoft.com/Forums/en-US/vistawu/threads

When you repost there, kindly include any Error Codes, and exactly what happens when you attempt to Update.

That way you will receive the best help there.

Cheers.

Mick Murphy - Microsoft Partner

I need to 1st install service pack1 on my Vista operating system in order to install Windows 7 and I keep recieveing error code 643 when I try to install service pack 1.