The Harris Levels must be downloaded separately as WAD files. You will find them here: http://doomworld.com/10years/bestwads/infamous.php
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The original Doom, Doom II: Hell on Earth and The Ultimate Doom do not run on Windows 7, due to incomplete MS-DOS support, and the total lack of a 16-bit subsystem on 64-bit versions. Doom 95 will run on Windows 7, but suffers from numerous bugs. Doom 3 will run fine on Windows 7.Note that the original DOS versions of these can be played in DOSBox. There are also ports of the Doom engine to Windows that will allow you to use the original data files from the DOS version, with essentially the same gameplay.
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You have to buy the full version for $14.95. But you can download the unregistered version for free. (You only get 7 levels for the unregistered version.)
If you mean the ds version: Beat circuit mode, all of the events and levels will unlock as you progress into the game If you mean the Wii version: I have no idea!!
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