It's safe to remove version 1.0. You have to check the DLL mappings of IIS for your existing web applications by clicking the Configuration... button in the Home Directory tab in IIS. Make sure that the Executable Paths for the .NET file extensions point to the 1.1 folder.

If they are still set for 1.0, you have to run the IIS registration utility for version 1.1 (aspnet_regiis.exe).

>Hello all
>
>I'm running under space problem in my harddisk, i have both the versions of .net framework in my machine.
>
>V1.0.3705 = 1.26GB
>V1.1 = 40.3 mb
>
>So is it safe to remove V 1.0.3705 ? Has anyone done this.