Right-click on the svchost process that is using all these resources.
Click "Go to Service(s)".
Scroll up and down, the services associated with this process will be marked.
Write them down.
Go back to processes in Task Manager.
Right-click on My Computer on your desktop -> Manage
Go to Services.
One by one stop (don't disable, just stop) and start the services that you wrote down.
After each stop, take note if the RAM and CPU usage problem has been resolved.