I _am_ the administrator

I'm trying to install Adobe Air on this Mandriva/Linux/FSF system to try the BBC iPlayer. Tried the various links from the BBC page and the Adobe Air phase just seemed to do nothing. So followed these instructions, and I get this message:

I tried running it as root and then as myself when it asked me to enter the root password but still the same result. I am the administrator, I'll go and talk to myself for a bit...but I think I need a bit more work to get iPlayer up and running!
(the suggestion I found on googling of closing down firefox first, doesn't work for me, I suspect it might want use of audio, tomorrow will try immediately after a login so nothing else will - I hope - be getting in the way)
Later (31st Dec)... I've tried logging out and in, tried it with kde rather than my preferred blackbox desktop, tried rebooting and again with both kde and blackbox, so at the moment I'm stuck, maybe a little more googling?
And again... Mandriva 2008.1 (which I'm running) comes with firefox 2.x.x, I've previously installed firefox 3 but with a tarball and in my home area, I guess Adobe Air is looking for firefox 3 and when it doesn't find it stops with that unhelpful message. I've now added the main backport repository and installed the firefox 3 rpm and now Adobe Air installs correctly! (a good diagnostic would have been so much more helpful!!!)