Failing To Transfer Large Files Over Network?

I'm trying to transfer files from my wired desktop to my wireless laptop, and smaller files seem to transfer okay. Whenever I try to transfer a really large file, however, the internet and connectivity totally drops on my desktop (which is giving the file) and causes the laptop to lose the file. The desktop computer stays offline for about 1-2 minutes afterward before it either starts up again on its own or I reset the network adapter. I suppose it's important to note as well that the file transfer can fail at the very beginning, in the middle, or even at the very end, but my desktop computer always loses its connection whenever the interruption happens... but sometimes it can successfully get almost all the way through the file transferI tried following some of the steps in this case to confirm that I can ping and do all that jazz to my laptop and all of the services are running, since our problems seem similar. I've disabled all firewalls as well. However, since one computer is actually wired to the router, I don't think the solution will be quite the same