>>>Perhaps not accurate, but if one removes eg version 2.0, then I wonder if anything will run anymore
>>>_
>>>
>>>>That's not quite accurate. 2.0 is an upgrade to 1.1 and actually changes some of the assemblies. Some namespaces/classes/etc are replaced with new ones. 3.0 and 3.5 do not touch the core 2.0 assemblies, but rather add additional assemblies. So, updating 1.1 and 2.0 doesn't do anything to the 3.0 or 3.5 versions.
>>>>
>>>>
>>>>>Mike,
>>>>>
>>>>>Framework 3.0 (and hence 3.5) is built upon 2.0. 2.0 is built upon 1.1, .....
>>>>>
>>>>>So, updating 1.1 is updating 2.0, 3.0, and 3.5
>>>>>
>>>>>I would advise against removing any earlier versions
>>
>>3.0 added WCF and WPF to the 2.0 runtime if I remember correctly. The core stayed the same and ditto for 3.5. If you remove 2.0, none of the later software will run.
>
>So can I remove v1.1 ?

I wouldn't, but you can try and see what happens... LOL