Don't quote me on this... but I think you need to Flush your DNS on your PC...
I know the Tutorial is on this website. Just search for it. I'm on a droid. Limited to what I can do.
My Computer
At a glance
Windows 7 Ultimate x64AMD Phenom x6 1045t8 GBATI Radeon HD 5570
Computer Manufacturer/Model Number
HP Pavilion Elite HPE-410f
OS
Windows 7 Ultimate x64
CPU
AMD Phenom x6 1045t
Motherboard
N/A
Memory
8 GB
Graphics Card(s)
ATI Radeon HD 5570
Sound Card
Realtek Highdefinition Audio / 5.1 Dolby Setup
Monitor(s) Displays
HP w2207h Widescreen
Screen Resolution
1680*1050
Hard Drives
1 TB (fixed), 320 Portable maxtor, Server Hard drives
If you are entering the DNS into your IPv4 properties on the Win7 machine it might work better to add the DNS entries into your routers DNS settings and leave the Win7 machine on aquiring the DNS automatically.
It also usually works best to use a DNS that comes from someplace other than your ISP. Many to choose from that will work better.
My Computer
At a glance
Windows 7 Ult, Windows 8.1 Pro,Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHzG.Skill PC2 9600 1200Mhz 5 5 5 15 2TGTX480