Linda,
Here are instructions on how to make the built-in support for .zip work
again:
1. Launch an explorer window to My Computer
2. Tools | Folder Options...
3. When the 'Folder Option' dialog appears switch to 'File Types' tab
sheet
4. in 'Registered file types:' list control scroll all the way to the
bottom
5. Select the last entry (should be the ZIP extension)
6. Now click the 'Change...' button
7. an 'Open With' dialog should appear, when it does select 'Compressed
(zipped) Folders' and the click OK
8. click Close button on 'Folder Options' dialog
You have just reassociated zip files with the built-in support!
I hope this helps,
Dennis Davis [msft]