Video downloading website for asha 201

I have asha 201. Before downloading any video(song,trailer etc) from some websites, my handset shows  a message "This application is not from a trusted supplier". Can I download video from this type of Untrusted supplier? If not, then plz give me some addresses of trusted supplier.

Remove the microSD, then a Nokia 201 calculates the internal memory correctly. If that does not help, go for Menu » Apps » Gallery » Options » Memory status » Free memory: if you have less than 2  MB, you have to clean the internal memory (or their is a hardware failure).
ashanewbie wrote:
What can i do instead of taking it in for Nokia to look at it, which will mean it's away for 10 to 14 days.
Did you consider the Nokia Software Recovery Tool on a Windows computer already?