I finally got mine to install after 7 failed attempts...heres what I did.
1. go to
http://support.microsoft.com/default.aspx/kb/290301
2. download and install the utility
3. use it to uninstall the Windows Installer configuration information for
all of your .NET Frameworks listed when you run the program. this program
just removes the interfering configuration files which are causing the error
code #643, NOT the actual .NET Frameworks being used by your system so you
won't need to re-download or re-install them :-)
4.*optional- clean your registry(I did)
5. reboot your computer
6. now install v. 1.1
"sim 32" wrote:
> My pc always prompts me of a critical update, service package version 1.1 for
> vista. Every time I try to install the update, of coarse, always fail to
> install and give me an error code 643. Hopefully somebody knows how to fix
> this problem and can help me out.