PSP X5 Ultimate does not start anymore under Windows 7

[Hpf97]

This is a strange thing : I have PSP X5 under my computer for about one year, and this morning it does not start when I click on PSP icon.
When I look at the process monitoring, the exe appears and disappears 3 seconds later.
I tried the restore database, nothing changed.
I tried to rename the database file, no more success.
Can someone help me ?

[Kathy_9]

Are you sure it's not running in the background? You can check by looking in the task manager.

If that's not the issue, you can try the Shift trick. Launch the program by clicking the PSP icon while simultaneously holding down the shift key. It will ask if you want revert to factory (or some such verbiage) and you will click okay.

[Hpf97]

Thanks for your reply but :
- it does not appear in the Task Manager.
- the Shift method does not work : as without the Shift key, "Corel Paintshop Pro (32bits)" appears in the task manager then disappears

[Hpf97]

Well, I uninstall and re-install it, re-register it... then it works again.
Why it stops working ??????