Using aspnet_regiis 29 January 2009 Andrew NetFramework ASP.NET IIS Registration Tool (Aspnet_regiis.exe) Refer: http://msdn.microsoft.com/en-us/library/k6h9cz8h(VS.80).aspx under %windir%\Microsoft.NET\Framework\v2.0.50727 or v1.1.4322. aspnet_regiis command can be used to install or update frameworks When I need to choose ASP.NET Versions between v1.1 and v.2.0 on ASP.NET tab of Default Web Site Properties in IIS Manager but I can't see v1.1 so that I used the command to install v1.1. > aspnet_regiis -i By the way when I use the command with -lv parameter, I can see the output below 1.1.4322.0 Valid ... 2.0.50727.0 Valid (Root) ... The problem is that I want to switch Root to v1.1 and there is a way to do it. > aspnet_regiis -sn W3SVC/ (means default:Root) sn : install scriptmaps for this version at the specified path, non-recursively after that you could see the changes and using sn option, you can change scriptmaps by site. ie) -sn W3SVC/1/ROOT, W3SVC/3/ROOT ... plus, -lk option with the command you can see IIS metadata keys affected. Grant user or group to the IIS metabase and other directories After you create a new website or virtual directory and browse a aspx file, you might have error such as... The current identity (NT AUTHORITY\NETWORK SERVICE) does not have write access to C:\WINDOWS\Microsoft.NET\ Framework\v2.0.50215\Temporary ASP.NET Files'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. [Answer] You can grant access to this account explicitly using the aspnet_regiis -ga switch, for example: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215>aspnet_regiis -ga "NT Authority\Network Service" [Ref] aspnet_regiis -ga Grant the specified user or group access to the IIS metabase and other directories used by ASP.NET.