If it helps - i found Microsoft's info page on how to do it also - might cover something I missed.
http://support.microsoft.com/kb/310543

hmm - you might want to explore the accessibility features-

[Accessibility Tutorials / Windows XP
Use Large Icons
You can enlarge the icons on your screen to make them easier to see or to access by choosing the Large icons option. This procedure tells you how to select this option through DisplayProperties in Control Panel.]
http://www.microsoft.com/enable/trai...argeicons.aspx