Help with IIS7.5 and .net3.5

Hi all I have installed appwarmup_x64.msi on my Windows Server 2008 R2 box (IIS7.5), but I can't enable the module under the "Role Services" for IIS. Like he can in this picture: http://learn.iis.net/Content_Cache/1089/AppInit_Install.jpg Does this mean that the extension didn't install correctly? (it said that it did). Second, does this IIS Warmup/AppInitilize support .net 3.5 which ships with Windows Server 2008 R2? Or do I need to upgrade my .net version? If yes, to what version? Hope somebody can help me :) /Casper