✔ 最佳答案
sounds kinda similar to a problem i had installing halo 2 on my pc.
what i did, is ran the installer through the built in admin, and it worked fine.
just open a command prompt (run>cmd>enter)
and type this "net user administrator /active:yes"
without ".
install, and to turn it off again, type the same thing except replace yes, with no.
cheers.