Unable to load DLL 'OraOps10w.dll'

I am getting a strange error in a production environment. I have a service that is written in .NET and is using ODP. Everything with the service is running fine, but we are getting the following error when running one specific stored procedure:
Unable to load DLL 'OraOps10w.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
The stored procedure is actually executing without error, but this error is occurring in .NET. It has all of a sudden started happening on us yesterday and we have tried to restart the service and also rebooted the server. The DLL does exist on the server and we verified it has the proper security. I am very puzzled by this, because everything appears to be working as normal.
Any help is appreciated to try and troubleshoot this problem.
Thanks!

Hello,
Please see this thread:
Re: After upgrading to ODP.NET 10.1.0.400 existings Apps fail.
This is almost always a permissions issue.
- Mark

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Timestamp: 3/4/2010 12:11:23 PM
Message: HandlingInstanceID: 3d9a795c-1256-44c1-b018-f553d4023b12
An exception of type 'System.TypeInitializationException' occurred and was caught.
03/04/2010 07:11:23
Type : System.TypeInitializationException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : The type initializer for 'Oracle.DataAccess.Types.OracleDecimal' threw an exception.
Source : Oracle.DataAccess
Help link :
TypeName : Oracle.DataAccess.Types.OracleDecimal
Data : System.Collections.ListDictionaryInternal
TargetSite : Void PostBind_Int32()
Stack Trace : at Oracle.DataAccess.Client.OracleParameter.PostBind_Int32()
at Oracle.DataAccess.Client.OracleParameter.PostBind(OracleConnection conn, OpoSqlValCtx* pOpoSqlValCtx, Int32 arraySize)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
at Oracle.DataAccess.Client.OracleCommandBuilder.DeriveParameters(OracleCommand command)
at Microsoft.Practices.EnterpriseLibrary.Data.Odp.OdpDatabase.DeriveParameters(DbCommand discoveryCommand)
at Microsoft.Practices.EnterpriseLibrary.Data.Database.DiscoverParameters(DbCommand command)
Additional Info:
MachineName : MISTERC
TimeStamp : 3/4/2010 12:11:23 PM
FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3f0a163eed2abd49
ThreadIdentity :
WindowsIdentity : NT AUTHORITY\NETWORK SERVICE
Inner Exception
Type : System.DllNotFoundException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Unable to load DLL 'OraOps10w.dll': Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
Source : Oracle.DataAccess
Help link :
TypeName :
Data : System.Collections.ListDictionaryInternal
TargetSite : Int32 AllocValCtxFromNoFmtStr(System.String, IntPtr ByRef)
Stack Trace : at Oracle.DataAccess.Types.OpsDec.AllocValCtxFromNoFmtStr(String numStr, IntPtr& numCtx)
at Oracle.DataAccess.Types.OracleDecimal.GetMaxValue()
at Oracle.DataAccess.Types.OracleDecimal..cctor()

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iwan,
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