Microsoft .NET Framework 1.1 Service Pack 1




I have Windows XP Pro with Service Pack 3. Everytime I go to Microsoft
Updates and attempt to download Microsoft .NET Framework 1.1 Service Pack 1,
I get an error message....DOWNLOAD HAS FAILED. What could the problem be?

Thank you for any assistance you can give me.

Peter Foldes

Credit goes to PA Bear MS MVP

When installing updates using Windows update or Microsoft Update you may
receive Error 0x643 or 0x80070643 (23 Oct-09)


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

Step #2 => Now see Resolution Method 2 in...

When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0,
or 3.5, you may receive Windows Update error code "0x643" or Windows
Installer error code "1603" (ignore the title, if need be)

After running the appropriate/needed tool, (re)install 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: Please read
ALL of it as well as the related page before using the .NET
Framework Cleanup Tool.

Step #3 => Check-in at Windows Update and install any critical security
updates offered.

<end snip>


Mines doing the same and with no error code, just this msg.

The following updates were not installed:
""Microsoft .NET Framework 1.1 Service Pack 1 Security Update for Windows
2000, Windows XP, Windows Vista, Windows Server 2008, Windows 7, and Windows
Server 2008 R2 (KB953297)""

When I go to CP-Add/Remove- this is what is installed.

MS .NET Framework 1.1
" " " 1.1 Hotfix (KB928366)
" " " 2.0 SP2
" " " 3.0 SP2
" " " 3.5 SP1

Also went to %systemroot%\Microsoft.NET\Framework and found folders
mentioned in article Found two
mscorlib.dll's; one under v1.1.4322 ver.# 1.1.4322.2407 and one under
v2.0.50727 ver.# 2.0.50727.3603.
Also under 2.0.50727 was a sbscmp20_mscorlib.dll file.

WinXP home (all updates except this one)
PA Bear: Will follow your instructions but want to make sure order for
reinstall is correct for my system.

PA Bear [MS MVP]

Please begin your own thread or...

See the "How to obtain help" section of

For home users, no-charge support is available by calling 1-866-PCSAFETY
(and/or 1-866-234-6020 and/or 1-800-936-5700) in the United States and in
Canada or by contacting your local Microsoft subsidiary. There is no-charge
for support calls that are associated with security updates. When you call,
clearly state that your problem is related to a Security Update and cite the
update's KB number (e.g., KB953297).

Or you can...

Start a free Windows Update support incident request:

The Consumer Security Support home page & Microsoft Update Solution Center
also offer support options

For more information about how to contact your local Microsoft subsidiary
for security update support issues, visit the International Support Web

For enterprise customers, support for security updates is available through
your usual support contacts.

Rich Barry

Thank You Mark and Peter for directing me to the right source of info I
needed. Papa Bear Lighten up. Way to anal.

Mark Adams

Rich Barry said:
Thank You Mark and Peter for directing me to the right source of info I
needed. Papa Bear Lighten up. Way to anal.

Glad to hear it helped.

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