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As per my knowledge there is not way to get the information on all the version of installed ASP.Net on the server. However, you can get the version enabled for your website from the scripts.
BTW: normally ASP.Net 1.0 and ASP.Net 2.0 are installed on the IIS6 and on IIS7 you should have all the version till 4.0.
I may not be more helpful. SOrry
Regards,
Sanjay Santoki