.NET Framework Initialization Error

[Danny Schindler]

'Unable to find a version of the runtime to run this application'

I have .NET 4 installed on my XP machine but I get this error.
I see from another link it needs .NET 3.5. Would I have to downgrade?

[Justin Chalfant (Patch My PC)]

Yes, You do need .Net 3.5 http://www.microsoft.com/en-us/download/details.aspx?id=22

[Danny Schindler]

Thanks. It works fine on my Vista with 3.5 but I need .NET 4 on the other PC.
Will your app. be compatible any time soon?

[Justin Chalfant (Patch My PC)]

.NET 4.0 and .NET 3.5 can both be installed on the same machine.

[Danny Schindler]

Ok thanks, will try again

[areis22]

You should really put a little note that mentions requiring .Net 3.5. It can be quite misleading.

[Justin Chalfant (Patch My PC)]

ON the website?

[areis22]

Wherever you see fit. Maybe a requirement/prereq page.