>>>>>When I try to install Infragistic NetAdvantage for .Net I receive an error message.
>>>>>
>>>>>I followed everything mentioned for Vista (UAC and IIS) but still I get the following error
>>>>>
>>>>>Error 1609. An error occured while applying security settings. Administrator is not a valid user or group. This could be a problem with the package, or a problem connecting on a domain controller on the newtwork. Check your network connection and click Retry or Cancel to end the install.
>>>>
>>>>Hi Denis.
>>>>
>>>>UAC is off, right?
>>>>
>>>>Have you tried getting ownership of your folders?
>>>
>>>Yes UAC is off. I'm not sure I understand well what you mean by ownership of my folders. I always log as Admin.
>>
>>It's just a thought... I installed it over here (version 7) and it went alright.
>>
>>About the ownership, have a look at this KB
>>http://support.microsoft.com/kb/308421/en-us
>
>Update : I installed again but this time I only installed winforms (custom install)
>
>Everything installed ok. So it looks like it's asp installation that is causing the problems. Probably something on the IIS side.
>
>I don't know anything about IIS but if anyone have an idea?


Denis, this might be something to do with your IIS ASPNET account.
Try googling "aspnet account" and you will get many good articles.