Originally Posted by
Tisane
High CPU usage while playing games like Civ 5 is normal. The high memory usage sounds weird to me, especially if it's constant, but I'm not sure if that could be the reason for your main problem.
What's the windows process called? A windows process eating 15% of the CPU can be normal, however that's not always the case, depending on which process it is. It can simply be because of an updating process, but it could also be a faulty driver.
I'd use a recovery point first just to rule out whether it's definitely the windows update that caused it or not.