If you installing new instance of SQL Server 2008 or adding new features to an existing one and got this error
SQL Server Setup has encountered the following error:
Invoke or BeginInvoke cannot be called on a control until the window handle has been created..
I won’t recommend you to go to http://support.microsoft.com/kb/975055 and waste your time installing SQL Server 2008 SP 1 because it won’t solve the problem.
Close IE\Explorer windows or anything you can open after doing your installation process🙂 yes that’s it… weird..