The above answer is pretty comprehensive, but if indeed you want to go from FASTQ to FASTA, then the FASTX toolkit--among many other programs--has a module for that:
http://hannonlab.cshl.edu/fastx_toolkit/commandline.html#fastq_to_fasta_usage
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What have you tried so far? Google suggests that conversion to FASTQ, rather than FASTA, might be what you want.
Similar question here: Converting Bcl To Fastq
I think the best solution right now is bcl2fastq: http://support.illumina.com/downloads/bcl2fastq_conversion_software_184.html. It is a standalone app released by Illumina, although it may not be supported in the future as they put more resources into BaseSpace.