Realtek HD Audio Manager - No enhancements 'tab'!

Sorry if placed in wrong forum-part!
I have got trouble with the Realtek HD Audio manager, I used to be able to change the 'environment' of my headphones, but this tab is no longer available to the program! I want to change the environment setting - where you can change it to 'sewer pipe' and 'hangar', all those strange options. I have my headphones plugged in via USB, with the Headphone (Green) and Mic in (Pink) cables plugged in the correct socket. I never had any drivers to download as these headphones+microphone is designed for Xbox's but has always worked fine with my PC. Instead, there is only a microphone tab, and I can't change many options on that. Any ideas on how I can fiddle with the drivers/set up to change it back, to be able to change the 'environment'?

Many thanks, apologies for bad english, post was written quickly.