that he really uses it only for email/Internet. Tho he has Works he has no printer so unlikely to use Word I suppose - could that be uninstalled ?(and put back if he ever needed it).
Does XPs habit of putting into the first column of the Start menu the programs you use most often make any dirfference to boot-up speed? Cos apart from things I've mentioned he frequently uses MS Autoroute and an Encyclopaedia - both need a lot of memory.