Cant download itunes on 3 mob network. Any ideas?

I have 3 mobile internet at home. I have been trying for the last 2 nites to download the new itunes, but it just does not seem to be working. The download gets to 24% & then seems to freeze-no error messages, nothing. Just stops. This is the first time that I will have had itunes on my lap top & I am at my wits end. Any ideas as to why this is happening? Everyone I spoke to prior to this was telling me how easy it was, etc, etc but I just dont know what is going on.