In Windows explorer looking at the contents of the DVD drive, if you right click on the Setup.exe executable you should see the option "Run as Administrator".
Even if your user account is part of the Administrator group, it may not always be able perform all actions without restrictions. Sometimes you need to tell the OS that you are "putting your administrative cap on" so to say, to do something. Or else it can still consider you as a normal user.
I remember having been in this situation where I was not allowed to specify an alternate install location (greyed out). But cannot remember how I resolved it. But I'm sure I did somehow. Best bet is it is the above way.
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