Hello. I wanted to add to mam53's helpful comments as I hope that it will help other people who have similar installation problems (errors).

I am a complete newbie to Drupal / Drupal Commerce / Kickstart. I also have very limited experience with web developing and programming in general. I would like to develop an e-commerce business and after much reading, have decided that Drupal with Drupal Commerce looks like a good platform to build on.

I have started my project by trying to install Drupal Commerce on my PC which is a Windows 7 64-bit OS machine. I first installed Xampp (Apache Friends distribution) and this was simple and straight forward. I took on board the suggestions of setting up passwords for both the Xampp Controller and phpMyAdmin.

I downloaded the commerce_kickstart-7.x-2.0-rc2-core.tar.gz distribution from the KickStart project page (http://drupal.org/node/1821260) - this is Drupal 7 with Drupal Commerce together with lots of other great set-up utility functions from Commerce Guys.

I extracted the .tar.gz file using 7-Zip (this is recommended as the Windows extractor utility may lead to a non-clean extraction). The reason for this comment is what happened afterwards and the errors I had in the installation process.

The installation of the Kickstart 2.0 distribution started fine. But in step 4 (Install Profile), I got an error message - An AJAX HTTP error occured. HTTP Result Code: 200 Debugging information follows. Path http://localhost/...... StatusText OK ResponseText: Fatal error. Maximum execution time of 30 seconds exceeded in C:\xampp\htdocs\..... on line 2139.

I found mam53's comments above helpful and followed his suggestion of reseting the maximum execution time to 120 in my php.ini file in my Xampp\php folder.

I then continued to install the Kickstart. Thought that everything was fine because the installation picked up from where it had been left and went through the next few steps. But I then encountered an error in Step 8 (Import Content) - Failure to sort migration list - most likely due to circular dependencies involving CommerceKickstatNodebags_cases, ....

I found a post on these forums that suggested the 2nd error was not an independent error and was something to do with the first error.

I think this is right and I may have not had this second problem if I had re-started my Apache Server and mySQL after I had changed the maximum execution time value in the php.ini file.

However, I decided to un-install everything and start again with the new value of max exec time. I also changed the max memory for running scripts to 256M. But, I couldn't find any posts that quickly told me how to uninstall the Kickstart environment that had already been installed. In the end, out of a gut feel, I just deleted the folder in which I had extracted the Kickstart distribution file (which I had renamed to my project name and was a sub-folder in the \Xampp\htdocs flder. I also deleted the database I had created in mySQL before I repeated the install steps.

And this sorted everything out for me and I have a clean install of Drupal 7 & Drupal Commerce with the KickStart store, profile, etc.

I also think that my first error happened because I was using my PC for other tasks while the installation was happening.

I hope this helps someone.