[VB6] PRoblem starting compiled program with OCX

Hello all!

I've got a problem starting a compiled program (little Tetris-game). It does not start at all when the program is compiled!
When I run the program within VB6 itself, the program runs smoothly. No problems at all.
I've placed the OCX-file in the Windows an System32 directory, so it should be correct. I also registered the file using regsvr32.

It won't work on other systems also. Even when I make a setup with Setup Factory from Endigo Rose.

What to do?