Help Update 1.45.161.2 and Rooting Problem

[whittall1]

Hi,
I have a rooted Sensation vodafone branded but not on vodafone network.
I have just received a message that there is an update available (1.45.161.2)
When I try to install it I get and android symbol with a yellow triangle and exclamation mark.
I'm guessing that I cant update because im rooted.
Any advise would be appreciated.

Thanks
Dave