as defined by wikianswers-

(User Account Control) The management of user accounts in Windows Vista. Because malware has greater control of the computer when it is running in administrator mode, UAC was designed to enable more users to run their computers as a standard user rather than as administrator. A computer is more secure against attack if it is running with fewer privileges.

i have snip tool under do i undo this...its unnessesary for it to be running in admin mode.