And another post I'm answering :D so you may want to right click on the plugin in the folder and select "Properties" (I'm sometimes bad at goving directions since my computer is german >_<) and there are five tabs, the right beside the one thats open (should read "compatibility" something like this) and there you click on the second last selection (should read open this as administrator or something like this)
thats what i have to do in utau to even oto something! and info: this is for windows 7 i don't know that on other programs because the last version inhad was XP >_>