From the documentation:
"If you are using Windows 2008, install with UAC disabled. UAC must be disabled to install, configure, and run EPM System products. UAC can be enabled on end-user client desktops."
Also read the Oracle Support doc:
"Should User Access Control (UAC) be Turned On after EPM Installation and Configuration has been Completed? (Doc ID 1351365.1)"
Here is the link for that : https://support.oracle.com/epmos/faces/DocumentDisplay?_adf.ctrl-state=2m1bav4i3_9&_afrLoop=352976331610718
You will need to login to My Oracle support to refer this doc.