prob with Realtek 8111D (nic/lan driver)  

Hello, I am running win7 64 bit on:
GIGABYTE GA-EX58-UD3R LGA 1366 Intel X58 ATX Intel
using the onboard nic
LAN: Realtek 8111D
Here is my problem. I can get to the internet with limited (to almost none) connectivity. I can get onto world-of-warcraft and get 60 fps for hours on end with no lag at all, I can have bit-torrent running for hours with no issues, however when I try to browse internet pages it just doesn't connect, and quickly too..like it can't resolve dns or something - not like it's waiting for a response from some site out there (the error message comes up immediatly. I tried this on firefox too and same thing. I disabled ipvx6 and to no avail. I tried using opendns, and that was no help. I am using a router but my other computers hooked up to it (xp) don't have any problems. On the other end of this, I can't find any drivers for win7 from realtek. The vista 64 won't install (says this driver is only for vista) and the xp64 won't install (says can't install this driver on vista)...LOL.
I don't know why it connects sometimes an not others but once it starts not working it just degrades to no website connections. I have tried the tool that's part of win7 to dianose the issue but it doesn't find one. I am confused because I'm getting wicked fast connections to Wow and with bittorrent, it's just the internet browsers that won't connect...I have to hit reload like a dozen times before it catches and then maybe it downloads the page, maybe not? Also, I have re-installed win7 and the default driver (i think it's xp 32bit) from realtek..because without that driver the nic card doesn't work at all.
Any ideas??
PS, I have ubuntu cd install to run from memory and I can get on and don't have any connection problems either so I'm assuming it is NOT a hardware issue.

Here is the specs for my motherboard:
Model
Brand GIGABYTE
Model GA-EX58-UD3R
Supported CPU
CPU Socket Type LGA 1366
CPU Type Core i7
FSB QPI 6.4GT/S
Chipsets
North Bridge Intel X58
South Bridge Intel ICH10R
Memory
Number of Memory Slots 4×240pin
Memory Standard DDR3 2000+/1333
Maximum Memory Supported 16GB
Channel Supported Triple Channel
Expansion Slots
PCI Express 2.0 x16 2
PCI Express x4 1
PCI Express x1 2
PCI Slots 2
Storage Devices
PATA 1 x ATA100 2 Dev. Max
SATA 3Gb/s 8
SATA RAID 0/1/5/10
Onboard Video
Onboard Video Chipset None
Onboard Audio
Audio Chipset Realtek ALC888
Audio Channels 8 Channels
Onboard LAN
LAN Chipset Realtek 8111D
Max LAN Speed 10/100/1000Mbps
Rear Panel Ports
PS/2 2
USB 8 x USB 2.0
IEEE 1394 2 x IEEE 1394a
S/PDIF Out 1 x Optical, 1 x Coaxial
Audio Ports 6 Ports
Onboard USB
Onboard USB 2 x USB 2.0/1.1 headers
Onboard 1394
Onboard 1394 1x 1394a
Physical Spec
Form Factor ATX
Dimensions 12.0" x 9.6"
Power Pin 24 Pin

I had a similar problem. Check the driver in Device Manager. Windows used the 8111B driver for the 8111D network adapter. Solution was to force it to use the 8111D driver and remember not to update it in Windows Update.