what is happening when you double click the downloaded files.
1. What type of things are you downloading?
2. Where do these things that you download, go to?
3. Do you get any error messages when you double click these things?
4. Are any of these things attachments to emails?
5. What are the three letters after the (dot) on these things? (ie:this is a file.zip)
Answers to these questions will be helpful
Can't open anything that I have downloaded OSX 10.7.5 please help