unable to connect to internet or find connection, ethernet, please help!

i installed windows 7 beta version 7057 today

with 7048 which i had before and 7057 i am having a problem connecting to the internet
(or finding a connection at all)

the desktop computer is dual booted with xp, and is hooked up via ethernet to my router
if i boot into xp, internet works fine

i usually have to allow computers to run through my router by adding them to the attached devices list or whatever, but i cannot aquire a mac address or ip address by typing "ipconfig /all" into the command line..* so i am not able to add it to the attached devices

however, since it isnt even detected (usually it would be detected on the router but wouldnt get internet because it wouldnt be accepted by the router) i have a feeling its a more intense issue!

is this a bios issue?
my motherboard is an ASUS P4S800D-X series
if it is, could someone let me know how to install a new bios (i found a beta for "others" OS types.. but am not sure i should try it.. here: ASUSTeK Computer Inc.-Support-)
the driver is Beta Version 1006.002 for P4S800D-X Latest beta BIOS.

please if anyone could help!
a computer is kind of useless without internet connection.. and id love to use windows 7 since 7057 is really working well, smooth and stable for me

anyone can shed some light?
i would really, REALLY appreciate it!
ive been trying for hours to figure this out.. and cannot for the life of me (ive tried enabling dhcs and dns and wlan stuff in attached devices, i just cannot get it to work)


*when i do the ipconfig /all in command.. i just get this:
host name. . . : KARwin7-PC
primary Dns Suffix. . . :
Node type. . . : Hybrid
IP Routing Enabled. . . : No
WINS Proxy Enabled. . . : No

but nothing else below it!