Problems with Adobe Acrobat freezing

I have used Adobe acrobat for years but since recently it doesn't work properly. It is often/always not responding. I notice at the top it says this is Adobe Acrobat (64-bit) and other programs I have that are 64-bit don't work well either like Corel PaintShop Pro 64-bit. I have a feeling this has started after a recent upgrade but can't be sure. I can open the program ok but when I click on a file in the recent list I get the small hourglass and the program says it isn't responding. Sometimes a window opens and says it is checking something online, this never used to happen. Can anyone help explain what is going wrong? All I want to do is read PDF type docs and sometimes edit and sign a lease agreement.

The window says contacting HTTP................