This message was posted on behalf of Intel Corporation
We would like to inform that the Intel® PRO/Wireless 3945ABG Network Connection reached End of Interactive Support on December 2013, Intel no longer keeps drivers for it at the Download Center. You can check the Customer Support Options for Discontinued Intel® Wireless Products for details about EoIS products.
Your best option would be to obtain the driver from your Computer Manufacturer Support.
In our best effort and in case the manufacturer doesn't have the driver either, you might want to try the following options; unfortunately, we don't have a system like yours to test, so these may or may not work:
1. Try using Intel® Driver & Support Assistant and check if it detects your adapter.
2. Try downloading Intel® PROSet/Wireless Software and Drivers for Intel® Centrino® Advanced-N 6205, file: WiFi_Win7_64_19.70.0.exe. This download is meant for a newer adapter, however, the tool may be able to pick up older adapters such as the 3945.
Please let us know how it goes.