all of the DotNet versions install side by side in the %windir%\Microsoft.NET folders, they never overwrite each hooter, so you won't have an issue.
you'll just end up seeing a new folder appear after installation,and it will not affect anything that already exists...just be there for new code you care to write that uses the new framework, which you have to explicitly target when you are creating something in visual studio.
Lowell
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