Vista - Vista .NET Framework 1.1, Service Pack 1

I was able to get a successful install of the subject framework. After about
eight hours of frustration, I went part way with a possible route given by
http://support.microsoft.com/kb/923100.
First, I deleted .NET Framework 1.1 software via "Add & Remove" in Control
Panel. I restarted the system and re-installed 1.1 with no difficulty.
Second, I then tried to re-install SP 1 via Windows Update. It took me two
separate occasions, but the basic 1.1 update took first.
Finally, I again restarted and checked Windows Update again. I was presented
with the Security Update for 1.1, SP 1 and it also installed without a hitch
for me.

How was that for dumb luck!.
--
Experienced user, not an expert.