More than likely the issue is either the service for the injector driver has not started or the injector driver is not installed. The steps below should remedy this issue.
1. Close all instances of Visual Studio
2. Navigate to Program Files\Common Files\Micro Focus\NMShared\Injector\2.x (or the highest number present)
3. If the Injector driver is not installed - install the driver
4. If the Injector driver has not started - start the Driver
5. Click "Add Sample Entries"
6. Click "Test Injection"
*After step #5 notepad should should have executed and a blank document will appear. You should see a msgbox stating that injection was successful.