Which version to install?

I have two installation sources with me

1. Visual Studio 2005 Express Editions
2. Visual Studio 2005 Full

I know the full version has more functionality etc...
But I want to know whether having both the Express
Editions and the full version installed side by side will
create any problems

I already have Express Editions installed and now,
should I remove them and install the full version or
is it OK to leave them while I install the full version

I also have a CD named Visual C++ 2005 Express Beta 2.
I want to know which one is the latest - this, or the one
included with the Express Editions pack