Ok Network problem (

Setup

ADSL 1 meg connection

ADSL Router by mentor. 4 port
PCs

2 close to router with asus A7N8X Boards one connected with onboard lan, mine is usin a nic card (realtek)

Both connect fine

Upstairs i have an older setup with a jetway mobo, 128meg sdt 850mhz cpu AMD and a realtec nic same as mine.

Upstairs is the prob.

Initially it worked and has done but i keep losing the connection and now cant get it back.

Light is green on nic card, no orange activity light.
Router shows 3 lights to show a PC is there altho the light at top doesnt flutter like other 2, i presume this is the activity light. (link/Act).

Lan monitors says Yellow triangle limited or no connectivity.

Tried net set up wizard
Tried resetin router and going through set up again
Tried the repair operation which just Hangs on "Renewing Your IP Address"
Then fails.
All are set to gain ip auto and DNS Auto
Tried removing/changing Firewalls

All on Win XP SP2.

The connection has worked ok and ive altered nothing.

Ive been away 4 a couple of days now it doesnt work.

Please help.