Right click on your dock , choose dock settings > Position , then where it says "layering" choose either normal or always on bottom from the drop down menu .
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
HP
OS
Windows 8 Pro / Windows 7 Home Premium x64 dual boot
Memory
6 gigs
Graphics Card(s)
Nvidia GEForce 9400 GT
Screen Resolution
1600 x 900
Hard Drives
Internal - Western Digital 600 gb HDD
Internal - Western Digital 250 gb HDD
External - Western Digital 1 TB HDD