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I go the link
C:\altera\10.1\kits\cycloneIII_3c120_dev\factory_recovery. I can't find the file
cycloneiii_3c120_dev_factory_recovery.pof. Help me
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A .pof file is for an Altera FPGA configuration device. An FPGA would use an .sof file. If the FPGA is configured from external flash, then that flash would be programmed with the FPGA image in a board-specific manner.
The board has a MAX II device on it connected to Flash. That device will program the FPGA at power-on. This board would not use .pof files.
I'd recommend programming the FPGA with the Board Update Portal (BUP) .sof image, and then connecting to the board via the web interface. From there you should be able to program a new image into the Flash. The BUP image should be the one located in the factory_recovery folder, its called bup_3c120_fpga.sof. So long as that image does not expect data in flash (eg., the web pages it serves), it should be enough to get you started.
Cheers,
Dave