Xen users - Dec 2007 - centos 5.1 and xen

I have just upgraded my centos 5.0 to 5.1, and so have upgraded xen from
3.0.3 to 3.1 (in redhat/centos terms, from 3.0.3-25 to 3.0.3-41)

My pv linux guests work as expected, but I have a windows xp hvm that
will no longer start.

Well, it starts, and I get the xp logon, then a blue screen with an error
msg to the effect that I''m trying to write to read-only memory, (I dont
have the exact msg text, as the screen clears and reboots too quickly.)

I''m assuming this is some sort of windows bug, but presumably is
triggered
by a change to the virtual hardware introduced by the xen upgrade.

So:

    has anyone else seen this?

    what exactly are the changes to the virtual hardware (and can they be
    reversed, at least to verify the problem)?

    Can anyone offer tips on how to debug the win xp problem?



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The problem is something to do with Zonealarm.

I went thru the hassle of creating a brand-new XP domu, installed from cd 
iso, added sp2, downloaded firefox, putty, AVG free, zonealarm -

While installing zonealarm, XP fell over with the same problem ''trying
to
write to read-only memory'' blue screen.

So I removed zonealarm from my original XP domu (I still had a centos 5.0 
system with network access to the domu disk images), and now it comes up 
ok.

Does anyone know of an alternative windows firewall that (unlike the MS 
firewall) checks outgoing as well as incomming connections?

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