Interesting thing about black screen problem

Yes, I have a black screen problem again, but I found an interesting thing. I have 4 versions of GP4 (one for league, two with original season, one with 2002 season). The black screen problem is only on the GP4 installed from CD with no add-ons. This exe is in registry, others are not, because they are copys.

It looks like, that problem infect only the GP4 which is in registry.

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Hmmm...I have done a clean install from the CD and i do get a few black screen problems N CTD's. Maybe i shud tweak with that registry on XP.