Your RAM usage seems to be higher for not just one thing, but many. Lets take wmpnetwk.exe in Process Explorer. Mine shows a little over 9,000k and yours shows 17,000k. Is the Windows Media Player doing anything during this time or using network resources?
The svchost.exe at the top with 205,000 K, can you tell what is running in it? Hold your mouse over it to see a listing.
Have you run any other anti-virus programs, like Malwarebytes?
And you can, in Process Explorer, suspend some running tasks by right clicking. Doing some that way may freeze your system and force, but you may find what is involved in your problem.