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1. depends on screen resolution, if set at higher values you wont notice the difference, using fullscreen fix is only for those who really like to play that way, i alwas played on windowed because i'm usually multitasking around.
Btw:there's no "system risk" unless you mess with the files
2.There's absolutely no need to "mess with the OS", win 7 just hides your files if in /program files, just change the install directory to whatever place you'd like.