Remove one memory stick and swap around to see whether it fixes the problem, you need to check them individually to find out if any of the stick is faulty, don't forget to seat them properly.
You could try resetting IE under Advanced tab, if that doesn't help, use sfc /scannow command from this tutorial:http://www.eightforums.com/tutorials/3047-sfc-scannow-command-run-windows-8-a.html
You could try disabling Power saving feature in Power management tab(Device Manager) by untick "Allow the computer to turn off........) and switching DNS to either google dns or Open dns also may be helpful.
How to change the DNS settings on the Dlink DSL-3680
I have v7.0.5 (Win 8) in my Win 8.1, you could try different versions from here:Download Drivers and Manuals | Acer Official Site
One of them will work for you, it doesn't show in start up for me as well.
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