dwm.exe high memory usage normal?

Desktop Window Manager (dwm.exe) is the compositing window manager that gives you all those pretty effects in Windows Vista: Transparent windows, live taskbar thumbnails
What happens in Vista is that applications write the picture of their window to a specific place in memory, and then Windows creates one “composite” view of all the windows on the screen before sending it to your monitor. Because Vista is keeping track of the contents of each window, it can add effects when layering the windows such as the transparency we’re all used to, as well as the live preview thumbnails..
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It should be the same in Windows 7.

No you memory is fine and you don't need to worrie about anything. If everything is answered for you please mark as solved :)

Well yes it does tell something. It shows that Desktop Window Manager is what is using that ram you are concerned with and that it is normal.

Ro88, There is nothing wrong in the screen shots you showed. NOTHING.