.net framework 3.0 0x643

I have read many threads about this and the solution always seems to
be: uninstall all previous (.net) versions and reinstall and all should be
fine.
I've done this 3 times 1.0 no problem...1.1 no problem...2.0 no
problem....also
hot fixes and sp updates. It always fails with this generic error on 3.0.
I have XP SP2. Any troubleshooting ideas? Tnx..

First, see http://support.microsoft.com/kb/923100 (ignore the title).

If no joy, see this recent post by my colleague MowGreen:
http://groups.google.com/group/micro...76de7769d04493

--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002
AumHa VSOP & Admin http://aumha.net
DTS-L http://dts-l.net/

JackD930 wrote:
> I have read many threads about this and the solution always seems to
> be: uninstall all previous (.net) versions and reinstall and all should be
> fine.
> I've done this 3 times 1.0 no problem...1.1 no problem...2.0 no
> problem....also
> hot fixes and sp updates. It always fails with this generic error on 3.0.
> I have XP SP2. Any troubleshooting ideas? Tnx..

This issue can be caused by a damaged .NET Framework 2.0 installation. In
order to resolve the issue, we have to remove/reinstall previous versions of
..NET Framework. Based on its current status, I suggest trying the following
troubleshooting steps.

Step 1: Download Microsoft Windows Installer Cleanup Utility
=============================================
1. Please visit:
http://download.microsoft.com/downlo...BD/msicuu2.exe
2. Save the file on your Desktop
3. Double click the file "msicuu2.exe" on the Desktop to install this tool
on the computer.

Step 2: Remove the previous version of .NET Framework 2.0 if installed.
================================================== ===
1. Click "Start"-> "(All) Programs"->"Windows Installer Clean Up".
2. Please locate and remove all .NET Framework products.

After removing .NET Framework components, let's reinstall .NET Framework 3.0
and its updates.

Step 3: Manually downloading and installing Microsoft .NET Framework 3.0
================================================== =====
1. Click the following link:

Microsoft .NET Framework 3.0
http://go.microsoft.com/fwlink/?LinkID=70848

2. When the file download window appears, please click "Save", and follow
the directions to save it on the Desktop. After downloading the Microsoft
..NET Framework 3.0 setup file on your Desktop, double-click to manually
install it.

3. After completing the above steps, please restart the computer and install
the updates for .NET Framework 3.0 from the following links:

Microsoft .NET Framework 3.0 Service Pack 1
http://download.microsoft.com/downlo...30SP1setup.exe

Update for .NET Framework 3.0: x86 (KB932471)
http://www.download.windowsupdate.co...1a583dbb81.exe