What does OS X look for to detect a Classic system?

[goldenbaby]

hi
    When I go to the Classic preference panel, the listbox lists my one and only HD. In other words, nothing to choose.
 However, if I go to the Startup Disk panel, it lists for me three (3) different systems (all on my one and only HD).
 One of them is OS X, the other two are two OS 9 system folders. Now, one of those two are a new, fresh, OS 9 system that I am hoping will work together well with Classic. The other one is a sort of corrupt version (somethings weird with it). How do I tell Classic to not use that evil system folder, but instead the good one?
 I can only choose the disk in the Classic preference panel, not the system folder that it will use.
 BTW, I renamed the bad system folder so Classic shouldn't "find" it when it started, and I also removed these files from the system folder (cause I think they might be what identifies a system):
 
 Finder
 Inloggning ("Login" in english?)
 MacOS ROM
 Paneler ("Panels" in english?)
 PowerPC Enabled 9.0.4
 System
 System Resources
 
 How can I make that bad OS 9 system go away, so I can be sure that Classic uses the good one to start OS 9 mode??
 
 Thanks for any help I get

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[G.A.Pster]

Not a clue I have a Imac (got it for free) but I’m a complete Mac neophyte.