I just updated my MiKTeX and now nor latex, neither pdflatex not compiling my tex. Even if it contains only
No error messages are shown, no files are created. It just hangs.
Based on the comments to your question, I think you will have to completely remove Miktex and reinstall it.
What worked for me on Windows 7:
Install all latest MiKTeX updates:
Refresh FNDB (file name database) using MikTeX Options:
During this step, additional packages were installed.
The reboots were done because, after testing, there were issues with processes locking files.
Possibly related: On my system I got an error message about a missing QT5 DLL, which I solved by installing package:
I had to delete my *.aux file and there was a *.synctex(busy) file which I also deleted. Then I could compile again.