Each time I run the install of over my previous version of ZAES on XPsp3, I hang at 6% while copying vsdataold.dll

I tried uninstalling ZAES which warned me about quarantined files; I let it delete them.

During the fresh install I hung at 18% while copying zlquarantine.dll

Each hang had 100% CPU utilization and no disk I/O and I let one hang run for an hour.

I tried the same install EXE on another system and the upgrade worked OK.

What should my next step be?