SSIS first shot problem

First time you will use the SSIS designer to create a package you will try to add new task, May be Microsoft will welcoming you by this error
"Failed to create the task"
and you will not know why (yeah it trick to find the cause)l aftre some search and some trying you will find that the solution is

Go to Windows services, check account under which "SQL Server Integration Services" run.
Switch it to "Local System account"

for more details http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=162315&SiteID=1