I see that Purrdey has found that,

I can't unzip any downloads from Rendo or from RDNA

It is easy to change the settings in your router ...

Click the link http://192.168.1.1/ (BTW, it might be a good idea to use Right-Click New Tab ... or print these instructions first [grin])

On the left side of the page, look for "Advanced" and then under that, click on "WAN Setup"

Click on the open check box to the left of "Disable SPI Firewall" and click on "Apply"

That should do it. 

OK to send me a site mail for more info. 

--
Martin