I used it last week with no issues. Today, however, I tried to open it, and after clicking on the New Project button in the welcome screen, nothing happened. It acted like it was opening the program, but then it went from the loading bar to displaying the New Project button again.
Short of reinstalling, I've tried running it as an administrator; I went to the file extension and tried opening the Adobe Premiere Elements.exe, but it thinks I'm running a trial version, when I bought the software and it's already fully installed, and displays a "created using the trial version of Adobe Premiere Elements" across the middle of my videos, which as a video blogger, is not something I really want displayed on my content.
I've never had a problem before this, when I've been using this program for over a year!
I tried it, and it made things worse. It undid the workaround I managed to get with the Adobe Premiere Elements.exe (once I entered the serial number it got rid of the 'created using a free trial version' message... using this uninstalled the Adobe Applications Manager that it needed, and then undid that registration, so I'm concerned now for how many uses my serial number has left)
Still doesn't get the main Adobe Premeire Elements 10.exe to work.
I'd recommend you contact Adobe Tech Support. There's more going on than we can handle on these forums. Sorry.