Acrobat DC does'nt open files

I have a Dell Precision laptop 7710 model, with Windows7-64pro.

The computer has a preinstalled full version of Acrobat DC, which worked perfectly until yesterday.

I have also recently installed Creative Cloud (Photoshop and Lightroom). I Had, after installing it, also "activated" using the CC menu, even Acrobat DC. Today I accidentally uninstalled Acroba DC always through CC menu.

From that moment on, I was not able to open pdf files.

I uninstalled and installed the program several times, using the app "Dell Digital Delivery", which is available for this type of operation on Dell PCs. But no, the pdf file will not open. I also uninstalled Adobe Reader!

From within the program, you can print to PDF and save the file you get. But then you can not open it!

Help !!!!!

thanks