After using Lightroom CC for a short time period. I get the Microsoft busy indicator / blue circle and Lightroom hangs.

I have windows 8.1 and a Radeon video card. I've uninstalled and re-installed Lightroom and I've upgraded the video driver. I've been an Adobe LR and PS customer for a long time but will need to use some other product if this does not get resolved. Please help.

thanks