Encoder conflict-anyway around it?

I am running sony vegas video editing suite and it appears that there is a conflict with encoders if I have roxio’s media creator installed.Once roxio is uninstalled the vegas video runs fine.Is there any way that i can have both encoders on the same pc and has anyone come across this before??
I really like the transitions that roxio can produce(for slide shows) but if one has to go it has to be roxio as Sony Vegas is streets ahead in video work.