HELP PLS

Hello,
My father in law is having trouble with his client. I bought him a new computer so he has windows 8 at the moment. 
when hes in game the time will stop and the game will no longer work. so it it making him lose games. it keeps being disconnected from server. i have the game on my computer which is not windows 8 and i am not having this issue. the problem does not seem to have anything to do with the internet connection.
Can someone please help me with a solution? Thank You

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