Sir;
If you are unfamiliar, do the simple things first. If you double click "My Computer" icon on your desktop, does the drive show up? If it does, can you click on it and open it from there?
Also, right click on the same "My Computer" and select Properties which will open up a System Properties page, select the Hardware tab at the top and then select Device Manager. Scroll down to the drive you are seeking and click on it to see if you can at least get access to it. If it has an yellow exclamation mark or other warning flag attached, that will give you an idea if there is a problem. If you can get in here, there is a simple Troubleshoot button and you can attempt a fix there.
Let us know if you get this far and what happens.
Regards
carholme