Dear tbtater,
Open Control panel.At the top you will see TOOLS.Under Tools you will see "Folder Options".Open it and click on "Restore Defaults". Restart computer and check whether your problem has been solved.
If this does not do the job,go here:
http://www.dougknox.com/xp/file_assoc.htm
This will fix what is called file association types.They are Zip files and download whatever extension files are causing the problem. Please get back and tell what happened!
