Basecamp won't open. Microsoft.net problem

Yesterday, I worked with basecamp on my laptop without any problems. Today, I go to open basecamp and I get a message that I need to uninstall and then install microsoft.net framework.

In response to this I've tried unsuccessfully to repair with the microsoft repair program, and I've uninstalled and then re-installed both microsoft.net and basecamp.

Everything else on my laptop works just fine. I've got microsoft 8 and use chrome operating system.

Any help would be appreciated!