Cant download anything from marketplace

Clear your cache?

 

^^ Try that.
If it doesn't work then do this.

Reset your connection by unplugging everything modem and router for about a min and plug the modem in first then when it gets connection plug in router.

 

I had this problem for a while. My brothers and I are all on the same router and so is my computer. my router and modem were built together (gateway). I disconnected all of my brothers xbox live cabels, and my computers from the router/modem, then I could actually download stuff.

If this doesn't work, try clearing some space on your harddrive or get a bigger one.


Since these guys that tryed helping you didn't get you much information about clearing your cache, I'll tell you how to do it.

Go to your Memory in your dashboard, before selecting your HDD device, press Y and exit out of that screen then press these following buttons on your controller:
XX left bumper right bumper XX (If I am correct, please correct me if I am wrong.)