nodkrn23 is a spyware process.. see here for more info..
http://spywarefiles.prevx.com/RRIJIF...N23%2EEXE.html
The rest all are valid processes
hkcmd - Intel Hotkey Command
ehtray - Windows Media Center tray (u dont need it unless ur using media center regularly, else u can disable it, doesn't make a diff)
igfxtray, igfxpers - intel integrated graphics
You can do a simple google search for the process name and u'll get more info on it..