Notification Center open and will not close and......

My desktop that I installed Win 10 Tech Preview on one day had the Notification Center open down at the bottom right and when clicked on it show "otifications" no new notifications .... my antivirus Software McAfee LifeSafe no longer will work
and when I do a search for anything.. all the letters and words are either jumbled or missing letters as in the "otification" center.

Since Windows 10 Technical Preview is just a "beta" version, there are certain amount of compatibility issues when it comes to 3rd party programs.
Heck, we can't even play DVD in Windows Media Player, and Windows Media Player is a MS product.
Avast, as I understand it, is not compatible either.
Perhaps McAfee is facing the same issue. You might want to ask the people in McAfee support forum about the compatibility matter.
I have a laptop running Win 10 build 9860 as the only OS in the system.
I am using the build-in Windows Defender as "real time" protection, and Malwarebytes  (free edition) as "on demand" protection. So far, I have no security issue.
As to letters and text garbled or missing, you need update KB3008956
installed.
Go to your Windows Update > click Check for updates >find and install that update.

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