The command to use to disable UAC (if UAC is on, must be run from an elevated command prompt) is as follows (watch for word wrap, as this should be run as one long command line):
CODE
C:\Windows\System32\cmd.exe /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 1 /f
You can disable the security pop-ups by clicking the red security icon, and clicking the "Change the way security center alerts me" link on the left (choose don't notify me and don't display the icon if you so desire).