I find it very strange that both your qlikview documents and your qlik sense apps can't be opened. Are you sure the files haven't been corrupted during the copying from one machine to the other? Or perhaps something with the security settings of the files? Did you transfer those files in a zip archive? Perhaps you need to unblock those files so that windows knows it should trust them.
I am assuming that you are using the Personal Edition.
I am also assuming that you copied your qvf files to the same folder on the new computer where they lived on the old computer?
If that is all true then I would agree with Gysbert that there is a security issue on the new computer. Try copying a word doc or some kind of file into the same folder and then see if you can open that.