Well after reinstalling a couple of times to prove that the slow down occured after a microsoft update I have found that intel has released Server 2008 drivers for my P35 chipset.
Installed these new drivers and performance back to normal. yippee
lol, I knew there must have been an easier way.
By default after installing 2008 enterprise edition I had the UAC popup. I am pretty sure I also had the popup when I used 2008 standard also.
Anyway after disabling I no longer get the popup.
Thanks for the great guide.