hai its regarding - powerbuilder 8 - exe shows some problems in some XP machines

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hai its regarding - powerbuilder 8 - exe shows some problems in some systems, can you help me to sort it out? I am using the PB Ver 8.0.4 - Build 10501. I got this problem from one our client site. I installed the exe and copied all the required dlls in the system. Exe is working but accessing some areas shows illegal operation error comes. The same exe is working fine in another system with the same dll's.