Is it possible to install a regkey from a live cd?

Ive been working on a live cd project, based off of windows PE, for repairing windows 8 machines. I have a full gui with a windows 7 explorer shell and it is UEFI compatable /bootable. Ive loaded it with a bunch of tools for computer repairs, imaging HDDs, etc. This got me thinking what else i may be able to do. My question is would it be possible to install regkeys to the "targeted OS" via the live cd?

For example: Some virus and malware programs corrupt regkeys by disabling task manager, permission settings, changing proxy settings, home pages, etc. If i had a corrupted computer and booted off my live cd, would it be possible to write a batch file (or similar) to call a list of regkeys and install them to the hive of the corrupted computer's OS (and not the live cds OS)?

You should be able to do this with the reg command.

First load the hive you want to modify: reg load
Then delete the key then add it back: reg del and reg add

You will have to experiment to get the correct syntax.

Open a command prompt and enter reg /? for an overall command list then reg xxx /? for each sub command.