can't recognize MIDI Keyboard

I bought a MIDI keyboard, installed the drivers from the software that came with it, and set it showed up in the MIDI setup utility. when I opened up Reason the keyboard would respond and play but I accidently deleted the device from the MIDI setup utility and now even though I reinstall the drivers the MIDI seetup wont recognize any device even when I rescan it. What can I do??

I also tried adding a new device on the MIDI setup but that doesn't seem to do the trick or maybe im doing something wrong. can someone please help me?? thanks