How to find a file using Knoppix

[Gart Valenc]

I've got the «C:\windows\system32\config\system file is missing or corrupt» message and tried to restore the registry files it using Knoppix, i.e. copying the files in the SNAPSHOT file (REGISTRY_MACHINE_...) and paste them in the CONFIG folder. It seems I made a mistake because the REGISTRY_MACHINE_ files do not appear in the CONFIG folder. However, when I try to copy them again, I get the message that files with the same name do already exist and whether I want to overwrite them. I am using Knoppix v6.7.1. I do not see a 'find file' option in Knoppix? Any suggestions as to how I can search for and find them? Please, bear in mind my knowledge is very, very basic.
Thank you in advance for your help and look forward to your reply.

Gart