Unable to load DLL "OraOps10.dll"

I am running into peculiar issue. I am developing a windows based application which connects to Oracle database.
For initial testings, I have created installer and tested on different machines that I have. Each machine has Oracle Client installed and I did not see any problem in running application.
But when I share this installer with customer, he is getting error "Unable to load DLL OraOps10.dll". When asked he mentioned and has shown the Oracle Client installed on his machine and he is able to run other C# applications which connects to Oracle databases.
I do not understand why my application only getting above error. I even tried suggestions shared at One way to fix the "Unable to load DLL (OraOps.dll)" error but still no luck.
I even tried copying executables & DLLs manually on customer's machine. But still facing same issue.
So please help me on what else i can do.
Thanks & Best Regards
Sudhakar Chavali
P.S:
I am using Windows XP operating system and customer is also using same operating system. Both machines are of type 32 bit OS only.
This is the location where customer's oracle client installed: C:\oracle\product\10.2.0\client_1\bin and same is the version in my case too.
We both are using Oracle 10g and .Net framework installed is 4.0

The only thing that comes to mind is a .net version problem. Are you both using Oracle client 10g as well? Do you have an 11g client on your development machine?
There was no .net 4 assemblies in the 10g client, they didn't add that until 11. It's possible that something in his configuration isn't letting a .net 4 application load a .net 2 assembly.
If that's the case, then giving the client an Oracle 11g client will fix the problem.

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    Hi,
    So, I have been struggling with an issue for the last couple of weeks that is sending my mad. I receive the following error when attempting to make a connection to a database with my web app:
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    I'm a bit confused by your statement "+Tried installing ODP.NET just on the off chance it might help+". You can only get that error if you're using ODP.NET in the first place. A UDL file would test an oledb connection, so it's good just to make sure the client libraries are there and tnsnames configured correctly, but otherwise a bit irrelevant to this error.
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    3) if neither of the above help, use Process Monitor to watch the dll's loaded 'live' to see if there is some sort of permissions issue, but the well known permissions issue that you've probably found information about was specific to 9.2 and 10.2 client, and is not an issue with 11g. That is to say, the OUI sets permissions properly in 11g, but it's still possible an IIS admin may have cranked permissions down too tight.
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    2) What version of .NET framework?
    3) What version of 11g client do you have installed, and what did you install it from? ie, 11107.0 full client? or 11107.20 odac bundle?
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