Error: SOPC_BUILDER_PATH may be incorrectly set in your environment

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The project is simple enough and should be doable in 1 month if we have enough knowledge.

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Your project is doable in an evening if you read this tutorial:

http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial

Just install *exactly* the version of Quartus used to create the tutorial (Quartus 11.1sp1) and you'll find that there is already an example that works with the DE2 board.

Both SOPC and Qsys examples work with the Web Edition.

Cheers,

Dave