Horizon wont work when i click update

everytime i click update for horizon it comes up with a windows error Horizon has stopped working what do i do as i have a diamond account and cant use it

Nick to the bat mobile.

This is probably a .net framework error either download this clean up tool http://http://blogs.msdn.com/cfs-file.ashx/__key/CommunityServer-Components-PostAttachments/00-08-90-44-93/dotnetfx_5F00_cleanup_5F00_tool.zip

Or uninstall your current .net framework and install the latest version http://http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=21

Uninstall Horizon and download and reinstall the latest version from here Horizon
Also try the .Net Framework suggestions Labogani made. Good luck.