Lightroom 4.2 Installation Issue

Question

Leaving this around in case anyone else has the same problem -- Solution found -- Windows installer issues / registry issues -- used the Microsoft Fix it tool (http://support.microsoft.com/kb/2438651#reso3) to correct.  4.2 install ran fine.
I've read through the posts in the Lightroom forum regarding  LR 4.2 install issues. I will list here the things I've done to try to get the install to work:
1) Downloaded the installation software twice.
2) Ran the setup program in admin user mode.
3) Ran the install in admin user mode.
4) Get the following error in a Windows Installer window:
The feature you are trying to use is on a network resource that is unavailable.
Click ok to try again, or enter an alternate path to a folder containing the installation package 'Adobe_Lightroom_x64.msi' in the box below.
Use source:
c:\Users\RMJF\AppData\Local\Temp\{...}
What I have found (after displaying hidden AppData folder):
The location where the .msi file resides is different from the one defaulting in the above window.
I select this alternate path, but still cannot complete the installation.
Furthermore, when I cancel the install, I get this error:
Adobe Photoshop Lightroom 4.2 64-bit Installer Info
Error 1714. The older version of Adobe Photoshop Lightoom 4.2 64-bit cannot be removed. Contact your technical support group
I have been running LR since the beginning of time and most recently LR 4.1, so there is no 4.2 installed.
Also, I tried to fix the install of 4.1 via the programs in Control Panel. I cannot repair it and get this error:
The installation source for this product is not available. Verify that the source exists and that you can access it.
All versions (except the 1.0 version) were downloaded and installed from the Adobe LR site.
So, looking for suggestions.
Seems like there are some missing files from the 4.1 version that are hindering the install of 4.2???
All quite frustrating.  Hope you can get me to a speedy solution.
(System info:  Windows Vista 64-bit Home, SP 2, 20 GB of disk space to spare!  Also, I have set the install program to be allowed by the anti-virus program. I have run a registry clean-up, as well.  No other apps are running during the install.)
Message was edited by: marzo19

Answer 1

untill now, 3 phones later, and mayby 10 attemps later to install it: notting. the errors that i am gething are the same as above, but nothing helps for me.
even the microsoft fixid diden't help.
So also desperate.