Solutions
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camadidu's post in FSX CTD but no error was marked as the answerOk, I read the CTD guide. I let FSX bulid a new fsx.cfg, dll.xml and exe.xml and now there are no more CTDs. Now, I'll have to tweak the fsx.cfg file to get the simulator to perform better; with the default file, it runs very poorly.
I'm glad I didn't have to reinstall FSX.