Yeah this stuff is frustrating...
You can disable UAC just for Administrators ...
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"ConsentPromptBehaviorAdmin"=dword:00000000
then re-enable it once you have completed tasks that need it.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"ConsentPromptBehaviorAdmin"=dword:00000002
Regular, non admin users will still get UAC prompts.
Hope this helps
Jon