Don't know.
I would gather that if you have it uninstalled now and nothing else
is *not* working - you don't/didn't need it.
The .NET Frameworks are just bases for software writers to use in
their applications if they so desire - so their code doesn't have
to be quite so large and so that they have access to some internal
mechanisms in easier/better ways.
Unfortunately - the .NET Frameworks were not cumulative. 1.1, 2.0,
3.0, 3.5 and soon 4.0. Yay.
Do you *need* any/all of them - depends on what you have installed.
Most applications will tell you that you need them and/or offer to
install them if they do need them. ;-)
At this point - if the machine was mine - I would follow these
directions:
http://social.answers.microsoft.com/Forums/en-US/vistawu/thread/ea20ba99-017e-4ae0-975b-1ef8b771dff8
In other words... Use the .NET Cleanup Tool (Method 2), reboot and
install the .NET Updates in this order:
- .Net Framework 3.5
(
http://www.microsoft.com/downloads/details.aspx?familyid=333325FD-AE52-4E35-B531-508D977D32A6)
- .Net Framework 1.1
(
http://www.microsoft.com/downloads/details.aspx?familyid=262D25E3-F589-4842-8157-034D1E7CF3A3&)
- .Net Framework 1.1 SP1
(
http://www.microsoft.com/downloads/details.aspx?familyid=A8F5654F-088E-40B2-BBDB-A83353618B38&)
Should be good to go.
Needs repeating in full?
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...
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)
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/archive/2006/05/30/611355.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.