USB mouse and keyboard stop working

I just purchased a new PC with 16 GB of Ram and installed Windows 7 Ultimate 64 bit. My USB mouse and keyboard stop working randomly and when the PC goes to sleep causing me to have to do a hard reset.

I have researched this on the web and updated the USB hubs the devices to wake the computer but this has had no effect. My computer shop thinks that the problem is the 16 GB of RAM with Windows.

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