Easy one…
Download a free TFTP Server – recommend this one http://www.solarwinds.com/products/freetools/free_tftp_server.aspx
Install and note IP address of machine installed on. For example here its 10.1.1.10
Log on to your switch…
Switch# copy run tftp 10.1.1.10 config1.cfg
check the TFTP root directory and you should see your file – config1.cfg
Done.