Can't Open (Decompress) any ZIP files all of a sudden!

Hi
I've never had problems opening Zip files until a couple of days ago.
All of a sudden I can't open Zip files from 2 different sources.
I've tried downloading them in Safari and Firefox.
I've tried the built in expander and I've tried Stuffit (latest version) and The Unarchiver.
I keep getting error messages, usually saying the data is corrupted or that it was compressed with an unknown method.
I got the original file re-sent to me several times (a purchase from a consumer website) with constantly the same result.
Then today I received a different Zip file from a completely different source with the same result.
My computer is up to date with all the latest Apple software updates.
I've tried repairing disc permissions.
Anyone know of this issue or have any ideas how to fix it?
Thanks.

To The Apple Discussion Boards!
"I've tried repairing disc permissions."
Did you restart your computer afterwards? If so, download a "zip" file. In the window that pops up, make sure *"Open With"* is selected. Make sure Stuffit Expander is selected or another utility that you want to open all your "zip" files.
Option: Select +"Do this automatically for files like this from now on."+
Click the "OK" button.

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This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
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Can't Open (Decompress) any ZIP files all of a sudden!

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