HitFilm Express not responding

Computer specs:
Windows 10, Intel Core i7-6700HQ @ 2.60Ghz, 16GB installed RAM, NVIDIA GTX970M, 64-Bit

The very first time i downloaded the program it worked perfectly, no lag or anything. Then i thought that I wanted to have it on the go, i decided to download it on an external hard drive. But the program stopped working. The initial window opens, with the heading and tabs (home, project, edit, export) but everything else was black. I click around it, which triggers the Windows "HitFilm Express is not responding" popup. I uninstall and reinstall on the original computer and encounter the same problem. I have two drives in this PC, and I encounter the same problem with both drives. I've only had it for about a day now.

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