I have a windows 7 64-bit computer. I am using real player 11 to download you tube videos. Until last week I had no problem downloading but when I used a restore point to take my computer back to an earlier date I have found I cannot download. The real player icon appears on the top right hand corner but when I click on it it says 'unable to download' and a few seconds later at the bottom of the screen it says, "Navigation cancelled from this website". I have tried various ideas I have come across e.g. going to security set up and performing a number of actions or disabling add-ons but to no avail. Can anyone help?