Silverlight problems

Hope this is in the right spot. I purchased a used aluminum macbook. I transferred all my info and settings over from my old macbook using the migration assistant. Everything worked great except for Netflix wouldn't play. Called Netflix, said I needed an older version of Silverlight. So I deleted the version of Silverlight that was on my computer, went into Library, internet plug-ins and deleted it there too. ThenI tried to install the older version, but it won't let me because it says there is a newer version installed. I deleted everything I can see that is related to Silverlight, but it keeps saying the same thing that a newer version of Silverlight exists on this disk. Any suggestions? I just need Silverlight 3 to watch netflix online and can't seem to do this simple task.