This is for the purpose of removing Adware.Admass malicious spyware.
Also I would like to do some research online and learn how to work on the registry safely.
windows registry does not keep track of date and time of entry (as far as I know — though, maybe that info is hidden somewhere). So, the only way to know what has been added recently is to keep a running backup and compare (though, again, I’m not sure how to go about comparing registries).
So, the best way to keep spyware and adware out is to get a good anti-spyware app.
The safest way to work on the Registry is also, backup, backup, backup.
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