VeryPDF PDF Password Remover Installs VIRUS on your computer Internet

I installed a trial version of PDF Password Remover from verypdf.com. I tested it on a file that I use regularly (I wrote the file and installed a password to test). The program didn't work as I wanted so I uninstalled the program completely.  Their pop-up message kept appearing stating that this file was unlocked using the pdfremover and that I had to register the program to get rid of the pop-up window.  So I completely deleted the PDF file and after a couple days without the pop-up I put a new clean copy of the file back on the computer (copied from the original that was never touched by this program) and the pop-up started again right away.  I contacted verypdf.com and this was their response, "Hi, Thanks for leaving a message for us. If you use the trial version to remove the password by this software, the pop up message can not be removed. Thanks for your cooperation and best wishes for you."  I have sent numerous response and have never received a message.  because of them, I can never have a pdf file with that same name again.  very bad and dangerous company to work with.  Horrible customer service.  Stay way clear of these people!!!  (notice that the online chat is NEVER open, and the only contact that is answered is email?)  Kind of shady if you ask me.