Horizon has stopped working VISTA

Everytime i start horizon it pops up with horizon has stopped working i have NET.3.5 installed can anybody help me with this issue please

Uninstall Horizon from installed programs in control panel and download and install the latest version from this link: Download Horizon
If that does not fix your problem I recommend you install .Net Framework 4.5.1, keep 3.5 installed as well.

Okay thank you i will give that a try now