COM + transactions

Hi All,
i designed a COM+ DLL and created a visual basic application(.exe) that references this DLL. I installed this application on my machine and it worked fine. I installed this DLL and the .exe on a few other machine(which are all win. 2000) and they all worked perfectly. Now all, these were client machines.

I take the same dll and the same .exe file and installed it on a Win 2000 server. and it doesn't work. In the COM+ object transaction property i have transaction required. If i change this to transaction supported or transaction disabled then the application works fine. I have checked the services; the DTC is running.. i am literally breaking my head over this topic..this is a brand new machine and doesn't have any VB installed here..but then most of the client machines(other than mine) didn't have VB running either. i have used getobjectcontext.setcomplete & getobjectcontext.abort but to no effect..i am in a dilemma..

please help!!
thanking you in advance.