Upgrade of Centos 4.1 with 4.2 ISO disc

[bruce.stanley at prodigy.net (BRUCE STANLEY)]

Can I upgrade my Centos 4.1 system with the 4.2 ISO install disc?
 
 If so, how do I do it?  It seams to want to do a full (i.e. format, wipe out old)
 install over everything.  I do not want to lose my various configurations
 (e.g. kppp, kde desktop settings, etc) that I have already set up under
 4.1.  
 
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