I've used PE (2? and 4) succesfully in the past but with a new camera for some underwater uses (Sanyo Xacti 2) recording in MP4 and a year old computer - (Sony All in one) Duo CPU 3 GHz, 4GB RAM, Vista 64 bit - I thought I should upgrade to PE7. I have a SATA 455GB HD with 312GB available. I successfully edfited and burned a dvd with the new camera and computer in PE4. (Even though Vista doesn't garantee PE4 will run successfully).
Here's what I've done so far. Restarted computer numerous times. Checked for updated video driver (Intel G45/G43 chipset). Checked for updated QT. Worked with a small file of 2-3 clips.
Where should I start to troubleshoot PE7?
The problem is not Premiere Elements. It's that Xacti. It may record to MP4s -- but it's not the standard AVC MP4s that Premiere Elements is designed to work with. (This is common for flash-based hi-def camcorders, like the Flip camcorder.)
You'll need to convert those MP4s to a usable format in order for Premiere Elements to work with them.
The FAQs to the right of this forum tell you how to do this with Prism Video Converter.
That helps but the audio doesn't convert. I must be missing something.
Also the Xacti came with PE4 delivered for editing. Why would they do that if the MP4's need to be converted?
It's unfortunate that the Xacti was bundled with Premiere Elements. From other posts on this forum, it's clear it's not a good marriage.