Why is my memory usage so high?

[DouglassDavis]

I restarted my computer twice, I'm running very few applications (I just opened the browser to ask this question). Yet my memory usage is almost 100% and my laptop is running very slow. My CPU and Disk usage are staying high too. It became a problem all of the sudden and the numbers will not decrease.What could be the issue? There is nothing in task manager that is using much memory. How can I find causes of memory usage that aren't shown in the task manager?Under the Users tab I'm only using about 370MB.I have 16GB RAM, and 352GB free on my hard drive.

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