Winzip and Windows XP problem, please help

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I needed to get some zip files from this website and they wouldn't open with the "comrpessed folder" function of windows xp. It said they were corrupt or invalid when I double clicked, or when I tried to "extract all" by right clicking it said "no files found" This would only happen with files from this one particular website. For all the other zip files on my computer or from anywhere else, they work fine with "compressed folder" in Windows XP. So I got Winzip 10 and now the zip files from that one site open just fine. Except now all the zip files on my computer no longer open with the "compressed folder" function in Windows XP. Now it says it is corrupt or invalid for all of them.

Please help me make Windows XP open all my zip files again.

Thanks.