The problem turned out to be missing references to HTREE in Bootlog.txt http://securityresponse.symantec.com/avcenter/venc/data/pf/does.a.refere nce.to.htree.in.bootlog.txt.indicate.a.virus.html If you can run scanreg from dos, you may be able to get to an earlier verasion of your registry and the system should launch
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