WordPerfect has stopped working ... before it even started :(

It all started with an issue with WP X5 which had been working fine for years
Caused my machine to crash and only in safe mode was I able to remove WP.
I made a clean removal "000004657 - How to remove WordPerfect Office X5"
now as soon as I open WP I get the "WP has stopped working" window
I do not seem to have any problem in QP, only in WP.

something I noticed when uninstalling (I have already done it 3 times), I get no "corel" folder in HKEY_LOCAL_MACHINE\SOFTWARE, only in HKEY_CURRENT_USER\SOFTWARE

... can this explain that ?

if you are kind enough to try to help me... please keep it in simple words... I'm no geek (alas !)

[Win7 Ultimate x64]