Hello to everyone.

I have installed ubuntu using the new download and install within the Windows installation.

For the most part Ubuntu is working fine but now and again Firefox will stop responding and the screen will dim, this can happen for a few seconds and then will become responsive again.

The other little gripe is that the whole OS seems a little slow, like when I click on the software center or click to load up firefox, it take a little while for the window to open up.

I have the recommended display driver installed for my Nvidia 470 GTX and I have done all the updates that are available for the OS.

Any kind of reason why I might be having these problems?

Thanks if you can help.