>>>>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?