OK. After looking around on the web I found that general OS "error" site also had a few people with this problem. I was surprised to find this, but thought I'd share to see if this helps you:
One of the posters states that "this error is usually caused by misconfigured system files....So, from my experience, if you received a Framework Error Caught ANSYS Workbench message then there is a 95% chance that your computer has registry problems..."
There's quite a few freewhere/shareware tools out there that can help you clean up registry issues. I personally use CCleaner, but there are many others. Here's a good review from Tech Radar.
So, use one of the mentioned tools to clean up your Windows registry, then reboot and launch ANSYS Workbench. Report back here if you have success.