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.