Save and transfer your PuTTY settings between computers

1. Click Start->Run and type "regedit" in the "Open" dialog. 

2. Press "Ctrl+F" to bring up the Find dialog. Enter the name of the key, "SimonTratham" in the "Find What" field, and make sure only "Keys" is checked in the "Look At" section of the dialog. Finally, click "Find Next".
Or Just Go HKEY_CURRENT_USER\Software\SimonTatham

3. Click File->Export. Give your file an appropriate name like, "putty.reg" and click "Save"

4. We're done! Save the putty.reg file somewhere safe. The file doesn't contain any passwords or actual SSH key values so, it's relatively safe from prying eyes. Still, it does contain your configuration and that kind of data is a private matter.