Microsoft offers a registry tweak to 'fix' this: http://support.microsoft.com/kb/951016, but I don't like registry tweaks. I think this setting should be included in Windows' Security Policy, so here's how to make that happen.
first make a backup copy of %SYSTEMROOT%\inf\sceregvl.inf
edit %SYSTEMROOT%\inf\sceregvl.inf as follows:
under [Register Registry Values], add:
MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\LocalAccountTokenFilterPolicy,4,%LocalAccountTokenFilterPolicy%,0
and under [Strings] add:
LocalAccountTokenFilterPolicy = User Account Control: Disable Remote UAC
Save
Start>Run: cmd /c regsvr32 scecli.dll
DONE! - a new option 'User Account Control: Disable Remote UAC' will be available in Security Settings\Local Policies\Security Options
Note: May need to change the owner of sceregvl.inf and grant yourself full control, but be sure to set owner back to what it was (NT SYSTEM\TrustedInstaller in my case)