Error -6003 during Creative X-fi driver install

So the installer says something like:

Setup has experienced an error.
Please do the following:
 - Close any running programs
 - Empty your temporary folder
 - Check your Internet connection (Internet-based Setups)
Then try to run the Setup again.
Error code: -6003

What do you do to solve this?

Why, erase any folder with a number as its entire name (mine was named “09”, but I’m sure it can be something else) in the following directory:
%System Drive%\Program Files\Common Files\InstallShield\Professional\RunTime\

No, it doesn’t make sense, but it worked perfectly. No reboot or anything. Just remove (or simply move) that folder, and things will start working. Brilliant.