There appear to be many people happy to offern generic advice in here without understanding the problem.
The problem is simple: The drivers available on the Cisco/Linksys website for the WMP300N, Version 2.0, will not install under Windows 7 64-bit because they are unsigned.
All drivers installed on W7 64-bit must be signed. This is something the developer of the driver has to do before releasing it, and they forgot to do it in this case. These same drivers will install fine on W7 32-bit but will fail with the following message when installed in 64-bit W7 machines: UUnsigned Driver Warning
If you choose to continue installing past this error, the driver will not load when you reboot the PC. You can verify this in Device Manager, where a yellow exclamation will appear next to the driver, and the device status window will explain that the driver cannot be loaded because it is unsigned.
There are workarounds for this available BUT they are not good workarounds. One of them is to press f8 every time you boot the PC and manually allow unsigned drivers to load, but this only works until you reboot the PC, so it's very annoying. Note that even when you do this, the driver will still not load correctly and a second workaround has to be done. This workaround involves permanently forcing your PC to run in test/developer mode. Again, this is very unsatisfactory.
Please do not post suggestions regarding workarounds you have 'googled' and not actually installed, tested, and verified yourself as there are many people with this problem that have already tried these "Is is plugged in? Is it turned on? Did you try rebooting? Did you try re-downloading the file?" simplistic approaches. Do not post links to the many, many websites that detail how to work around unsigned drivers as they all involve approaches that are 3 to 4 years old and were developed when Windows 7 was still new and there were many drivers that were not yet signed.
It is 2012 and Cisco/Linksys are not still learning how to develop drivers. The ones available are WHQP-certified but unfortunately the 8.x.x version is not signed, but the older 7.x.x drivers were. So it's simply an oversight and Cisco/Linksys need to correct this.
As it stands, because of this mistake, there are no Windows 7 64-bit drivers available for the WMP300N Version 2.0 boards from Cisco/LInksys beyond the 2009 version 7 drivers.
I hope that clarifies the situation.
