Searching for Credential Tiles but why

Have two computers an old AMD64 x2 3500+ w Vista Business and when running as
a ltd user and I need to run something with admin rights I am simply prompted
for an administrator password. However I have a brand new laptop with Vista64
and Home premium and try to run the same application Vista searches for about
10secs each time for Credential Tiles. I am not using RDP but simply have
these computers on a smal LAN.

Question is why is Vista64 doing this and is there any way to stop this
annoying habit, other than switching to an Admina account?

 

Found out that it is UAC which is for some unexplained reason slow as
molasses in January. Cripes 20 sec wait each time I want to run
something as Admin? What the heck is going on and why is my 3 year old
computer with Vista Business faster than this brand new laptop?

 

Problem was Validity Fingerprint Service that was causing the 20 sec
delay. With it disabled the limited user account functions normally
under UAC.