CAE and Windows XP

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I remember there was a post about Windows XP and CAE and not playing well with 
each other.

I checked the archives and even though I got a lot of hits back searching for 
"windows xp", the returns were vague and seemed to not have anythign to do with 
XP.

So, I went to the IBM site and came across this:

V5R1M0 with service pack SI01907 or later

Refer to the Support Statement in Information APAR II12900 for requirements and 
restrictions

Now, we are running V4R4 for our OS/400.  I just started rolling out XP 
machines (our vendor doesn't sell them with 98SE anymore).  Getting spontaneous 
errors with the program.

Can I upgrade CAE to V5R1 with V4R4 OS/400?  Not sure exactly what I am 
suppsoed to do.
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