Can UI mods be done in Vista

[trenchtown]

Alright so i am feeling a little dumb for Upgrading to vista but anyway. After getting all my hardrive wiped from the upgrade disc i got all my old UI mods back when i tired to change from Default UI to the new ones it would not let me save, i used notepad first it said the directory path is wrong. Then i tired with Wordpad after saving says access denied witch makes me think M$ is blocking any kind of add on or something... I am really pissed off because this is hindering my play experience.... I decided to try Thor UI cause i thought since it has a auto loader it might bypass anything the OS is stopping but again now i can't even log in to character select screen it stops right when the updating starts it stops from downloading?