First of all, these sites can help you identify running processes:
http://www.liutilities.com/products/wintaskspro/processlibrary/other/a/
http://www.processlibrary.com/
Disable these:
engutil - easy cd creator
igfxtray - intel graphics helper, tray
start - try to find out what it is from where it is located (Program Files/Cox - have you installed something called Cox (game or anything)?), but it shouldn't be necessary
Cagent - Compaq OCR
Drgtodsc - easy cd creator "drag to disc" - if you don't use it, disable it
rxmon - roxio easy cd creator - only needed when burning, so get rid of it from startup
Realplay - realplayer (get rid of it, and you may also want to uninstall it and install "real alternative" instead)
Qttask - quicktime tray (same as above, except now it is "quicktime alternative")
capfax - it should make phone and fax service more user friendly, if you don't use it, disable it
WinMX - WinMX Peer-to-peer file sharing tool, if you don't use it, disable it
msnmsgr - MSN Messenger if you use it, leave it
wkdetect - checks updates for MS Works, disable it.
fdm - "free download manager" download accelerator, if you are using it, leave it as it is, if not, disable (or uninstall)
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Also I would suggest you to try out
XP Anti Spy