how do I save a notepad entry as a .reg file

I am using windows vista 32bit operating system on a Dell inspiron 1525 laptop. Widows update stope working after a security update for windows vista sp2 was succeessfully downloaded and installedHave been trying to resolve a Vista 32bit windows update problem using the guidance provided in the answer to the "Missing windows installer service, vista sp2 64bit, cannot update anything" question. I can copy provided registry file to notepad but notepad only offers "txt file and all files" save options. I have tried to save using both options but get a "These are not registry files." response when attempting to import the the file into the regedit program.

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