There's nothing wrong with vista but flash.
There's an admin option where you aren't allowed to edit certain things in program files, you can turn that option off somewhere so you can just edit that file. (I forget where the option to turn it on/off is, I did it over a year ago)
You can also edit it without turning the option off, just do what gundam said.
Edit: Control Panel > User Accounts > Turn User Account Control On or Off
You'll have to restart your computer after you set it to off.
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