thanks! the installer did indeed default to program files (x86) and picking a different venue cured that problem
im still in some kind of trouble, though. i have i believe followed the installation instructions for SA6 and the two patches (with one ambiguity, details to follow). when i try to launch SA, there is no game, when i hit the "New" button i am running into (apparent) trouble. it will let me modify the checkboxes on the right, but i can't edit any of the text fields (like game name).
the one obvious place i might have screwed something up is, when installing SA6, a couple times i was given messages like "you have a newer version of this file already on your computer, we recommend you keep yours". the only one i really noted was a .dll file. i kept my existing files in such cases. was that a wrong decision, do you suppose?