I did download the installer from the website. I deleted all the files except for wallet.dat, downloaded the installer, and I run the application. I have no trouble now. THANK YOU SO MUCH 1000stskiller for your help! Somehow those files got corrupted yesterday. Now I know what to do next time if the problem should again.
Check your HDD for BAD sectors - maybe it starting to get BAD sectors - often when some programs/or files appears corrupted time from time, that means "possible HDD starting to have problems..."
