Problem installing WMP 10

Hi, I have a serious problem installing WMP 10. when I try I get the
following warning at the start of the install:

Check before continuing setup
The Setup Wizard has found one or more problems that could affect your
installation.
It is recommended that you turn off mini Player mode before continuing.

Problem is, WMP is not installed, and there is no mini player toolbar to
remove. If I carry on with the install regardless, and after what looks to be
most of the install process, I get the following error:

Cannot complete Windows Media Player 10 Setup
It was not possible to complete Setup; Windows Media Player 10 was not
installed.

I follow the advice to restart my PC and try again, but it makes no
difference, same problem.

Interesting thing is: I previously had WMP installed (sorry but I forget the
version, 9 probably), and I was using Mini Player mode. I'm wondering if the
problem arose because of that. Maybe the uninstall screws up somehow if Mini
Player mode is on at uninstall time.

Anyway, I imagine there's a registry setting somewhere that needs zapping.
Anyone know what it might be?

Thanks in advance, I miss my WMP!
Jon Starling