To: jbennet
Thanks for the answer. I've looked over the sites (e.g http://blog.crowe.co.nz/archive/2006/07/04/663.aspx, http://blog.crowe.co.nz/archive/2006/06/01/644.aspx) but all examples read info from MetaBase.xml. The "ScriptMaps" property chages after install/uninstall ASP.NET, but it very difficult to detect what scripts must be present here. There is not more clear property to define it. Help me if I am mistaken.

To dickersonka:
I tried to use this approach but It is difficult to parse output in localized systems. These commands return message string e.g "Cannot find any installed version", but how to parse it from different languages?.

To sierrainfo:
Thanks for answer, but I have not any key under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\.