Here is a fix for chromecast and broadcom wireless adapter
I have a lenovo b570 windows8 my problem was during setup.chromecast app it shows my chromecatXXXX but my computer would not connect
and I could not get passed set me up. The problem I had found is with the broadcom 802.11n BCM4313 driver. go to your manufactures
website and download your wireless drivers. You don't have to install the file, right click the driver setup program and extract to
filename\. Now open up device manager right click the wireless card, select "Update Driver Software", select "Browse my computer for
driver software locate and install driver software manually" next choose "let me pick from a list of device software". press "have disk"
browse to your driver folder you just downloaded. now uncheck the "show compatible hardware". Change "broadcom 802.11n network adapter"
to "broadcom 802.11g network adapter" Installing this device driver is not recommeded because windows can not verify compatible with you
hardware. Select yes. This should fix the problem.