you might want to check out <a href="http://castlecops.com/StartupList.html">http://castlecops.com/StartupList.html</a>. In general, you could try googling for the program name (including .exe). You'd be surprised what you'd find.
You're running norton antivirus (nav*.exe), which might be disabled, but you probably don't want to kill it.
tfswctrl.exe is HP's version of directCD, but I doubt it'll take up many resources.
Overall, you're not running many weird things. wdfmgr.exe may be excessive. It's part of media player 10, according to <a href = "http://www.liutilities.com/products/wintaskspro/processlibrary/wdfmgr/">http://www.liutilities.com/products/wintaskspro/processlibrary/wdfmgr/</a>