Sharepoint 2010: Upload Multiple Documents button grayed out – This control is currently disabled

In the last days we had a customer ticket which was escalated because a user in our Hosted Sharepoint 2010 environment had the following problem. He could not upload multiple documents because the button was grayed out and he got the message “This control is currently disabled”.

This is a feature which is a client integration component, which is available on machines with a installed Office 2010 client. So if you have a Windows 7 PC and Office 2010 installed you get the following:

1. The first time you navigate on the Document Library you get asked about a ActiveX Control Object
   
2. You can accept that
   
3. Maybe you get asked again
   
4. Now you can use the Upload Multiple Documents Button
5. And choose the Office Files
   

I found this solution in the technet forums