Hi, Before shane or boggins advice, pl better to download and read this pdf in the given link.
If you miss any step, pl have it mind to create a restore point , so that if it does not work, you could restore to previous stage.
If you have already gone thro this, just skip it and wait for Shane.
Normally packages files could be fixed with windows readiness tool. But since you have upgraded to windows 7 from vista, it is better that you read the pdf without doing anything.
Upgrading sometimes does not fetches full packages.