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Network error in Vista SP1

For the whole day, I can't access the internet because of some stupid networking error on my Vista SP 1. When I woke up in the morning, I saw a network error on my laptop with the yellow marking sign "limited connectivity bla..bla.."..this is not the first time..it happened several times before but I just have to reboot the machine and everything will be OK after that..but not this time..after rebooting more than a dozen times, the network configuration still won't assign proper DHCP address to my NIC instead it assign Microsoft's APIPA. This happen to both wireless and ethernet connection. The diagnostic tools doesn't help at all. It just give stupid so-called-solutions.

Here are some of the method that I've tried with no success:

1. Troubleshooting my wireless router. I've changed my network SSID, channel number, disable security settings and assign new DHCP range. Still no luck.

2. Reset winsock settings. I reset my winsock settings several times using the command netsh winsock reset. Still no improvement. My IP did change but it's still in the APIPA range.

3. Ipconfig release, renew, flushdns, etc. I've tried every command but they also don't work either.

4. Use static IP. Since I can't connect to my network and use the GUI settings, I use command prompt shell to set a static IP.

Set IP & Subnet mask:
netsh interface ip set address name="wireless network connection" static 192.168.0.103 255.255.255.0 192.168.0.1

Set first and second DNS:
netsh interface ip set dns "wireless network connection" static 192.168.0.1
netsh interface ip add dns "wireless network connection" 208.67.222.222

unfortunately, this method also PHAIL.

5. Uninstall wireless adapter via Device Manager.

6. Clear windows startup and select only core function to start during system boot.

7. Other methods. There are many more methods that i've tried. I spent more than 10 hours to solve this stupid networking problem with no luck.

..and finally, after many unsuccessful attempt, I just use System Restore. Although it work and solve the networking problem, my machine were full of mess from previously removed item.

But..it doesn't solve this shit 100%. I still have an unknown network location on my Network and Sharing Center which I have no idea where it came from. This is the shit that messed up my IP configuration settings in the first place and I can't get it removed from the list although all device have been disconnected. It's like an automated shit that appear even when there's no network connection. WTF?..Stupid Vista..full of bugs..Even in Service Pack 1, Windows Vista still have many unsolved bugs..this is one of the prefect example.

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