Programs Using Too Much Memory?

why the program "svchost.exe" is hogging a whopping 119,340 K of memory. I know there's like 10 of these with a bunch of different services, but it doesn't seem like any of the services this one uses should be doing much. I know I can just disable some of the services, but I don't really want to do that, seeing as how most of them help. The services this program is using are:

AudioEndpointBuilder, hidserv, HomeGroupListener, Netman, PcaSvc, SysMain, TrkWks, UxSms, WPDBusEnum, and wudfsvc.

Second of all, I'd like to know why a program called "DellDock.exe" can sometimes use up to 15 percent of my CPU, and over 30,000 or so K. I'd also really like to know what it does and if I can disable it. I mean, I know it has something to do with a docking station for a laptop, but my computer is a desktop. However, I also know that there's this thing at the top of my desktop that has programs I can use and such (along with folders for games and office supplies) that's called a dock, if I'm correct.

Third, the program "wdm.exe" is usually always lingering around 5 or more CPU, but not much memory usage. If I recall correctly, this may be the graphics on my computer, I'm just making sure. Besides, I wouldn't suspect Windows 7 graphics to really use that much.

Finally, I'd like to know why the program "audiodg.exe" is frequently using 15 or more CPU, while not using very much memory (27,680 K, to be exact). From my research, it has something to do with the audio of my computer (obviously), but I couldn't figure out much else. Some people say it's been using a lot and to disable the enhancements of my audio card by right clicking the audio icon to the bottom right of my page, but when I tried this I found that I don't even have any enhancements on at the moment.