SharePoint reserved word: PSS

While trying to promote a subsite to a site collection using a managed path called: PSS I received the following error message in PowerShell:

I was not aware that PSS is a reserved word, not according to Microsoft KB article 2497533 or MSDN .

At the end we ended up removing the managed path PSS and using a different one.

FAST Search Configuration: Error InstallULSCommonCore - An error occurred while executing binary msiexec. Return code is not 0.

I had to uninstall FAST Search 2010 on a server, then install FAST SP2 on the same machine, while ruinning the configuration wizard I got an error:

I did click on the link and found the following error message:

Error InstallULSCommonCore - An error occurred while executing binary msiexec. Return code is not 0.

I tried to install the ulscommoncore.msi file manually by going to the following location: D:\FASTSearch\installer\files (I did install FAST on D drive) and when I ran the install, I got the following message:

The good thing I had another machine that had the same version of FAST (I had TM FAST installed) that I managed o copy to the server, then ran the following command to uninstall ulscommoncore.msi

http://technet.microsoft.com/en-us/library/cc759262(v=ws.10).aspx#BKMK_Uninstall

I ran the following command:

msiexec /x

I ran the FAST Configuration wizard and it did complete without errors.