By this do you mean that you have to enter the password when you boot up? Supervisor passwords are usually setup in the BIOS. If this is the case, then there are a number of ways to remove them. You can remove them in the same way that you created them, i.e. through the BIOS interface. Another way is by means of a jumper on the motherboard. By far the easiest - and this is the method to use if other ways don't work - is to remove the motherboard battery, wait a few minutes, and then reinsert it. Of course, if you use either of the latter methods, your BIOS settings will all be set to their defaults, so you will need to re-enter any settings that are not default (you will, of course, need to set the time and date as a minimum).
4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
Graphics card(s)
MSI GeForce GTX770 Gaming OC 2GB
Sound Card
Realtek High Definition on board solution (ALC 898)
Monitor(s) Displays
ViewSonic VA1912w Widescreen
Screen Resolution
1440x900
Hard Drives
OCZ Agility 3 120GB SATA III x2 (RAID 0)
Samsung HD501LJ 500GB SATA II x2
Hitachi HDS721010CLA332 1TB SATA II
Iomega 1.5TB Ext USB 2.0
WD 2.0TB Ext USB 3.0