Tested on Power Of Duel 3.0, and worked!

1. Download the files: [You must be registered and logged in to see this link.]
2. Extract archive, and run konami.reg
3. Select Yes ..and OK.
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4. Now copy system.dat than the original from Yu-Gi-Oh! Power Of Duel/Yu-Gi-Oh! Power of Chaos Common

Finish!


For verification:
1. Go to 'bottom bar' and select "START"

2. Now select "RUN"
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3. Write regedit
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Open directory "HKEY_LOCAL_MACHINE", next open sub-directory "SOFTWARE", next open sub-directory "KONAMI".
Now Open sub-directory "system"
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And make sure that the values from "CommonDir" and "InstallDirJ" have the correct addresses from the game.
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Good luck.