|Try this first.|
Are you using a mousepad, or just a tabletop or something?
Is this wired or wireless?
If wired, have you tried a different USB port? (If it's PS/2, you could buy a converter)
If wireless, have you tried putting new batteries in it?
CPU: AMD FX-8350 - 8 Core @ 4.0 GHz
RAM: 2x4 GB @ 1600 MHz
SDD: Samsung EVO 840 500GB
HDD: WD Black 2TB
Mobo: MSI 970A-G43
GPU: Radeon 7870
OS: Windows 8.1 64-Bit