It's unclear where this problem lies. Does VP refuse to import files from the PC to its media bin (top-left)? Or is it not allowing clips in the bin to move to the timeline?
You mention that you have the latest, but what version is that? Click the three-lines menu, then HELP | ABOUT. Does the text mention "64-bit?"
Try rebooting, and reinstalling. No need to uninstall first. Here's a 64-bit release to test. Ignore any virus warnings.