I've had a look in the add/remove area and found the following
Microsoft NET Framework 1.1 and Microsoft Net Framework Hotfix KB886903
Cannot see any reference to having a version 2 installed...
So I guess I should delete them? But I did notice the suggestion that this is an important download so does it have to be downloaded again? Because surely the problem will start once more.
Good job you are patient. At least I am learning at the same time...