Tente isto:
1) Set it up (computer and router) to obtain ip address automatically.
2) Shutdown computers.
3) Power the router off then after 30 seconds, power back on.
4) Repower computers.
5) Confirm that you have Internet connectivity.
6) Make note of (in router settings):
a) Subnet mask.
b) Wan IP Address.
c) Default Gateway Address.
d) DNS Address.
e) Client IP Addresses.
7) Setup router to use Static IP addresses.
8) Configure Windows for Manual (static) IP addresses.
9) Insure Gateway is set as 192.168.75.1 in Windows.
10) Shutdown computers.
11) Re-power router as in step 3.
12) Re-power computers.
13) Confirm router settings are the same as before:
a) Subnet mask.
b) Wan IP Address.
c) Default Gateway Address.
d) DNS Address.
14) Confirm Client IP Addresses are as you configured in Windows.
15) Confirm that you have Internet connectivity.