My computer no longer executes most commands!

[SamIam]

I don't even know how I got online this morning. Almost everything I try to do, I get the message: "This file does not have a program associated with it for performing this action. Create an association in the Set Association Control Panel."

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I get this message if I try using "the last known good configuration feature" and if I try to use my virus scan software. Every fix I've thought of so far only results in the same message.

Any ideas?