Installer is broken on 4.1 in Windows 2008 R2 with the environment described below. At least two of us have exactly the same problem, so the issue is not local to us.
At the bottom is someone else's description as taken off the Installer forum. My experience is exactly the same, except I am running MySQL 5.1.41 instead of 5.1.42.
A third party suggested it has something to do with directory or session permissions, or PHP configs. To test this, I uninstalled tw 4.1 and installed 3.4 in the same environment. 3.4 worked just fine. Then I upgraded to 4.1 over top of it and it reverted to previous bad behavior. So I believe it is a 4.x bug.
I've given this a high priority because the software is unusable if you can't install it, so you probably losing a lot of users.
Here's the other guy's description of the problem:
I am trying to preform a fresh install of TW4.1 on Windows Server 08 R2, IIS 7.5, PHP 5.2.12 and MySQL 5.1.42. However, after filling in the page for the database information to populate the database, I reach a page entitled
Tiki Installer Security Precaution
You are attempting to run the Tiki Installer. For your protection, this installer can be used only by a site administrator.
To verify that you are a site administrator, enter your database credentials (database username and password) here.
If you have forgotten your database credentials, find the directory where you have unpacked your Tiki and have a look inside the db folder into the local.php file.
I enter the 'root' account information and hit 'Validate and Continue'. But it takes me back to the 'Welcome' page. Now any link I hit Takes me to the validation page and I enter the correct user (root) account info and I'm sent back to the 'Welcome' page. The install doesn't want to continue.
If you want, check out www.nerdzone.net to see the site.
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To help developers solve the bug, we kindly request that you demonstrate your bug on a show2.tikiwiki.org instance. To start, simply select a version and click on "Create show2.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show2.tikiwiki.org.
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