for the first time, I'm trying to use adobe premiere elements10 that came with my pc Windows 8. I created a single project, saved it but cannot open it. My pc shows the file I created but I get an error message that says this type file is not supported or

For the first time, I'm trying to use adobe premiere elements 10 that came with my pc Windows 8. I created a single project, saved it but cannot open it. My pc shows the file I created but I get an error message that says this type file is not supported or the codex is not installed. As a test, I created another very small project and get the same error message, when I try to open it. Pls give me a simple answer, a refund or a phone