When you reinstalled Windows, Windows probably did not include a driver for your wireless adapter. A driver tells Windows how to interface with a certain device, such as a wireless adapter. You can easily download the driver online and install it. Once installed, restart the computer and you should again have the ability to connect to wireless networks.
I've gone to the Dell website for you and found the correct driver. Please visit this link: http://support.dell.com/support/downloads/driverslist.aspx?os=WLH&catid=5&dateid=-1&impid=-1&osl=EN&typeid=-1&formatid=-1&servicetag=&SystemID=INS_PNT_PM_1525&hidos=WLH&hidlang=en&TabIndex=&scanSupported=False&scanConsent=False
On that website, I would first try downloading the first driver on the list. If that doesn't enable your wireless after a reboot, try the other ones. After the correct driver is installed, your wireless will be working again.
Hi,
Seems what you needs is to check the device manager, see if the wireless card driver is reinstalled.
To go to device manager > click on start > then right-click computer > left click on properties > then click on device manager on the upper left corner. click on that and then check the wireless adapted under network adapter : 
if you have a ? on network connection. you might need to install the wireless drivers. then try to detect the wireless network again. ok? .
Hope this helps .
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