How can I force a static IP in Windows 7?
Because a picture is worth 1000 Unicorn Dollars:
Go to "Network and Sharing Center" > "Local Area Connection" > "Properties" > "Internet Protocol Version" > "Properties" > Set a static IP here. Then "OK", "Apply" and "OK" again.
If this doesn't work try connecting your computer stright into the NAS (will need a crossover cable or gigabit network connections in both the NAS and computer).
Try the command line and see if you have better luck:
netsh interface ip set address name="Local Area Connection" static 192.168.0.100 255.255.255.0 192.168.0.1 1
Type netsh winsock reset
in the Administrative Command Prompt, and then press the Enter key.
Do the same process for refreshing the TCP/IP. Type the following commands:
netsh interface ipv4 reset
netsh interface ipv6 reset
ipconfig /flushdns
Then reboot the computer. Once it's back up, go to your LAN adapter settings in the Control Panel, and try to set the Static IP information again.