Oracle Database Express Edition (XE)

Apologies if this isn't the appropriate forum.

I have just installed the Oracle 10g Express Edition. I have created a database and loaded the data for my test model. I successfully connected to the database with our C++ application using a file dsn (ODBC driver (Oracle in XE vs 10.02.00.01)). The data was brought in correctly and I was able to write back out some of the data. However, when I tried to execute porton of the code that requires fastwrite I received the following error message.

"Error in connecting to Oracle for fastwrite ErrorCode = 80004003, meaning = Invalid pointer, Source = (null), Description = (null) ..."

I also tried to connect using a file DSN using Microsoft ODBC for Oracle version 2.575.1117.00, I get the following error message right off the bat
"Fatal Error : Database driver [MSORCL32.dll] not supported."

I should point out that this is a fairly old application that have been running successfully on our 9i and 10g production database. I believe we typically use the Microsoft ODBC for Oracle driver. I am trying to do a nightly regression testing and for this I thought it would be simpler to use the express edition rather that bother our DBA.

I am trying to figure out whether this is truely a limitation of the express edition or whether this is a configuration issue. I am new to Oracle so the latter is a strong possibility.

Thanks,

Hong