Jonatjhan
Follow the steps below to rectify your issue and to install .Net 3.5 SP1
When installing updates using Windows update or Microsoft Update you may
receive Error 0x643 or 0x80070643 (23 Oct-09)
http://support.microsoft.com/kb/976982
=====================
Step #1 => Before doing anything else, write down what .NET Framework
versions are currently installed:
How to determine which versions of the .NET Framework are installed and
whether service packs have been applied
http://support.microsoft.com/kb/318785
Step #2 => Now see Resolution Method 2 in this related KB article:
http://support.microsoft.com/kb/923100
After running the .NET Framework Cleanup Tool, reinstall all .NET Framework
versions (but only the ones you wrote down in #1 above) manually using the
download links on the page then run Windows Update manually to install
security updates for same.
NB: If you remove .NET Framework 3.5 (SP1) using the tool, reinstalling .NET
Framework 3.5 will also install .Net Framework 2.0 SP2 and 3.0 SP2; then
Windows Update will offer .NET Framework 3.5 SP1.
IMPORTANT! => If you remove .NET Framework 3.5 (SP1), reinstall your .NET
Framework versions in the following order:
1. .Net Framework 3.5, then...
2. .Net Framework 1.1, then...
3. .Net Framework 1.1 SP1
NB: KB923100 references this page:
http://blogs.msdn.com/astebner/archi...30/611355.aspx. Please read
ALL of it as well as the related page
http://blogs.msdn.com/astebner/pages/8904493.aspx before using the .NET
Framework Cleanup Tool.
Step #3 => Check-in at Windows Update and install any critical security
updates offered.
--
Peter
Please Reply to Newsgroup for the benefit of others
Requests for assistance by email can not and will not be acknowledged.
"Jonathan Crawford" <> wrote in message
news:...
> Hi
>
> I have a Vista Business machine that I bought from Evesham who went bust a couple
> of years ago.
>
> I use this machine solely for running Visual Studio 2008. Recently this sarted to
> crash on opening.
> This seemed to be to do with .NET 3.5 SP1 failing to install in a windows update
> (even though it was installed)
> The machine won't go back to any restore point due to an "unknown error". I have
> uninstalled .Net 3.5 SP1 and
> reinstalled it and it still wants to apply the patch. I unistalled Visual Studion
> 2008 and it will not install again
> due to some error or other which did not make sense.
>
> I would like to reinstall the OS because this thing has taken enough of my life
> and I just want to be able to work on
> Visual Studio 2008 again. I have the manufacturers disk. I also have a jack russel
> who used to sit on the pc when he was a puppy
> and one day chewed off the serial number label.
>
> What I would like to do is put in the restore disk and repair the installation,
> however it will ask me for the
> serial number. I was wondering if it is possible to get the serial number off
> anyone from MS
>
>
>
> thanks
>
> kind regards
>
>
>
>
>
> ===============
> Jonathan Crawford
>
> ===============