Multimedia key stopped working for some reason

Oh, i think i need to RESET the device presets so the system won't remember any keyboards that were connected to it, so it can install my keyboard fresh, but i don't know how to do it.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Ultimate (x64) SP1
CPU
Intel Core i5 4460 @ 3.20GHz Quadcore
Motherboard
Gigabyte B85M-D2V
Memory
8192MB DDR3
Graphics Card(s)
Gigabyte NVIDIA GeForce GT 730
Monitor(s) Displays
1
Screen Resolution
1280x1024
Hard Drives
Seagate ST1000DM 003-1ER162 SCSI 1TB
C: - 466GB
E: - 465GB
Case
SilentiumPC Brutus M25
Cooling
SilentiumPC 120mm fans, one on the front, one on the back
Keyboard
Omega
Mouse
Zalman
Antivirus
Kaspersky Internet Security 2014
Browser
Opera Internet Browser
Have you tested your keyboard on another computer
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
dell xps 9000
OS
win 10
I don't have any other computer i could use.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Ultimate (x64) SP1
CPU
Intel Core i5 4460 @ 3.20GHz Quadcore
Motherboard
Gigabyte B85M-D2V
Memory
8192MB DDR3
Graphics Card(s)
Gigabyte NVIDIA GeForce GT 730
Monitor(s) Displays
1
Screen Resolution
1280x1024
Hard Drives
Seagate ST1000DM 003-1ER162 SCSI 1TB
C: - 466GB
E: - 465GB
Case
SilentiumPC Brutus M25
Cooling
SilentiumPC 120mm fans, one on the front, one on the back
Keyboard
Omega
Mouse
Zalman
Antivirus
Kaspersky Internet Security 2014
Browser
Opera Internet Browser
Well can you bring to friend or family to test. Need to rule out the keyboard.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
dell xps 9000
OS
win 10
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