I just googled the problem, and the only suggestions seem to be, apart from reinstalling is to download from a different site.
I always use file hippo for downloading, if you want to try this uninstall again, then type avg file hippo into google and download latest version.
There seems to be a lot of people with the problem, some have given up and downloaded another free programme such as avast.
Personally I don`t like avast, I would give it another go with avg and see how you go on.
Just a thought, but have you uninstalled Norton properly, I believe it can be hard work to fully remove, you need to download a removal tool from symantec.