After I updated it to 11.0.02 it stopped working!! 
It doesn't open any .pdf online in ANY browser and it doesn't open any .pdf file on my PC. I have Windows 7. Before that everything worked perfectly. But after that update it just doesn't. First it opens an empty inactive Reader window and after few seconds it closes it. In browsers when I try to open online .pdf documents it just gives me a blank black page. I tried it on my old PC where I have XP and after million tries it barely opened me a file that I urgently needed to print out. BUT it didn't wanna print out giving me an error something like printing opion is not found, so I had to use my favorite Print Screen key and Paint to then print out an image file (which means that there was everything fine with the printing options on my computer!).
What do I do? 
I've noticed there are a lot of complains here on the forum about this version of AR, so maybe it DOES have an error?