There are two tools that can help you with this. I use them when I need to perform registry management stuff.
EMCO Remote Registry Exporter http://emcosoftware.com/remote-registry-exporter is a freeware tool that allows exporting registry data. You can export registry from one or multiple remote PCs.
EMCO Remote Registry Merge http://emcosoftware.com/remote-registry-merge is registry exporting/editing tool that can work with one or many network PCs.
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