On Windows XP this will be in a folder called C:\Windows\Microsoft.NET\Framework\v2.0.50727
 
On Windows XP this will be in a folder called C:\Windows\Microsoft.NET\Framework\v2.0.50727
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If the 50727 part is a smaller number then you have a slightly older version of NET 2.0, but it should still work, you don't need to upgrade unless you are having problems with running ADRIFT.
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If the .50727 part is a smaller number (or missing) then you have a slightly older version of NET 2.0, but it should still work, you don't need to upgrade unless you are having problems with running ADRIFT.