Laptop won't connect to my Wi-Fi?

My laptop will not connect to the Wi-Fi but my iPhone and other laptops in my house are connected. I troubleshooted the problem and it said the network bridge doesn't have a valid IP configuration. I have no idea what to do please help.

1. Upgrade the Wireless network adapter driver. First you might go to Device Manager, right click your hardware device in the list and select Update Driver Software; then click Search automatically for updated driver software.

Note: Drivers on the Windows Update site are directly provided by hardware manufacturers. Microsoft tests drivers in various environments before they are published; however, we can't guarantee all drivers will work on all hardware platforms as there are too many different models, although their hardware ID are the same as the standard version. In some cases, due to hardware modifications by different manufacturers, the driver updates may cause some error.

If it still does not work on your issue, I'd suggest you installing the Vista driver in Compatibility mode. Remove and rescan that hardware device in Device Manager, right-click on the driver executable/installer file -> Properties and select the Compatibility tab; click the checkbox before Run this program in Compatibility mode for option and select Windows Vista in the list-down box; then try installing the device driver via Run as administrator. In addition, you can use the Windows XP driver for testing.

2. Obtain IP address automatically.

a. Click "Start", input "NCPA.CPL" (without quotation marks) and press Enter.

b. Right click on the connection that you use for the local connection, and then click "Properties".

c. Click to select "Internet Protocol Version 4 (TCP/IPv4)", and then click "Properties".

d. Check "Obtain an IP address automatically" and "Obtain DNS server address automatically".

e. Click "OK".

If the issue persists, please move the Windows 7 machine to another Wireless network for a test.