Oracle Connection object is not getting instantiated

We have a Web application developed in .net (code behind vb.net) using Visual Studio 2003 and Oracle Database 10G version 10.1.0.2. We have a test machine which we use to test our Web application with the same version of oracle. Our web application was working fine in that test machine until Oracle got corrupted in the that machine. After that I reinstalled Oracle 10G and when I tried to run the web application it threw an exception saying "Object Reference Not set to instance of an Object". When I went into that problem a bit deeper , I came to know that Oracle Connection Object was not getting instantiated (ie OracleConnection object=nothing). At the same time the web application is working fine in my machine. One of my friend suggested me that I have to register some of the Oracle DLL files using regsvr32 utility. But he is not sure which DLL to be registered. Also we do have a Windows Application developed in .net using the same VS2003 and oracle 10 G which is running fine in the same test machine.

Thanks for the reply. I was desperately waiting for that.
I found the following result when I run the gacutil utility on my machine.
The Global Assembly Cache contains the following assemblies:
Oracle.DataAccess,version=10.2.0.100, Culture=nuetral, PublicKeyToken=89b483f429c47342, Custom=null
The cache of ngen files contains the following entries:
Number of items = 1
But when I used the same utility on the test machine it resulted as follows
The Global Assembly Cache contains the following assemblies:
Oracle.DataAccess,version=10.1.0.200, Culture=nuetral, PublicKeyToken=89b483f429c47342, Custom=null
The cache of ngen files contains the following entries:
Number of items = 1
That is there was change in the version of ODP.net what I use in my machine and Test Machine. But I clearly remember that I have installed Data Access layer DLL's of the web project from my machine to the test machine and were running successfully befor eoracle got re installed on that test machine.

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