Cannot install Office:Mac 2011 14.1.3 on iMac 27in

Hey,

I have installed this update on my MacBook Pro 15in running lion without any problems.

When I try to either automatically install or manually install this update on my iMac 27in it cannot complete and tells me to contact support because there was an error.

I have changed the username etc etc but nothing seems to work.

Anyone else experienced this or know how to solve this?

Your help would be much appreciated.