Problem with multible Oracle clients on same machine

Hi!

I have multible Oracle clients installed on my machine: Driver={Oracle in 92} and Driver={Oracle in XE}. When I use SubSonic I want to read and write data to {Oracle in 92}, however, because I installed Oracle Express the default instance is now {Oracle in XE}. This causes the following error in my SubSonic project:

ORA-12154 TNS.... (plus something more which I can't remember).

I know this is not an error in SubSonic, but is there anybody that knows how I can tell SubSonic to use the right Oracle client?

My current workaround is to uninstall Oracle Express :-(.

*BUMP* Common guyz, don't leave me hanging here!!!

Help to this problem would be very VERY much appricieted.