Hi Allan,
Fairly sure that there is no Firewall/Browser issue.
There may be an installation issue, but the IDUU doesn't give much information out, does it.
Is this a common issue with the IDUU, be the only portal to install software for this machine.
Did a manual search for drivers, the only one available for this rig is the "Intel® Graphics Drivers for Intel® Core™, Pentium® and Celeron® Processors."
Big Hullabaloo about nothing as running an ATI GPU.
Went to the Gigabyte site, posted a ticket there as their flash utility mb_bios_ga-b75m-d3h_f15.exe for this mobo doesn't support 64 bit.
Running their utility "mb_utility_atbios.exe" now, which seems to work.
Will let you know if anything comes of it- or not 
Thanks again,
Laurie