Try the .zip file association fix here.
File association fixes for Windows Vista:
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows┬« Troubleshooting http://www.winhelponline.com
"R.A.R." <R.A.R.@discussions.microsoft.com> wrote in message news:82C1D26C-3B32-42FA-ADDA-F2BA7CED7F66@microsoft.com...
> "D.L. Barton" <D.L. Barton@discussions.microsoft.com> wrote in message
> >I installed a 3rd party compression utility (RAR, I think) and didn't like
> > it. So, I uninstalled it. However, now the built-in Vista ZIP
> > compression/decompression features are completely missing. No Send To ->
> > Compressed File or Extract option in Windows Explorer. What's up? How do I
> > get these feature back??
> Open regedit, navigate to HKEY_CLASSES_ROOT\.ZIP
> In the right pane double click Default and set the data to
> "CompressedFolder" without the quotes.
After I did all of that for some reason my .zip default remained my internet
browser. Also the registry had 2 other files;
Name: (Default) Type: REG_SZ Data: CompressedFolder
Name: Content Type Type: REG_SZ Data: application/x-zip-compressed
Name: PerceivedType Type: REG_SZ Data: compressed
Any ideas of what that all means????