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XPS l401x Wavess Maxx and other touch keys issue


I have a dell xps l401x which is more than 6 years old. I recently reinstalled the OS to windows 7 ultimate and since then waves maxx is not working. I have already installed the quickset driver as well as realtek driver. 

The touch buttons have been unresponsive for quite sometime but I never really cared. Also the wifi, Caps lock and battery indicator have not been working for ages. But the waves maxx was working perfectly fine with windows 8.1 that I had before this. I was wondering if there is a solution?

I have already installing drivers but to no use. 

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