Unable to install Adobe Air

Hi,

I am unable to install Adobe Air on my Macbook Pro (OS 10.6.8).

I had a previous version (2.7...) and uninstalled it.

I get the error "An error occurred while installing Adobe AIR.  Installation may not be allowed by your administrator.  Please contact your administrator." and I have followed the instrictions to deal with this here  http://kb2.adobe.com/cps/902/cpsid_90205.html but without success.

Can anybody help?

Many thanks,

Glyn