Same thing happened to me.. I noticed it for a couple days.. I didn't do this with the intention of getting rid of it but I think it got rid of it.. All I did was clean things up with CCleaner and later I noticed it was no longer there.. Again I did not run CCleaner with the intention of getting rid of the extra one but I later noticed it was no longer there...
My Computer
Computer Manufacturer/Model Number
Personal Build
OS
Windows 7 Ultimate 64Bit
CPU
AMD 450 Rana 3.2 Ghz (Unlocked into a Phenom II X4 B50 3.2)
Motherboard
Biostar A770E3
Memory
PNY 6GB @ 667 Mhz (2X2GB In Dimm 1-2, 2X1GB In Dimm 3-4)
Graphics Card(s)
XFX Radeon HD5830
Sound Card
RocketFish 5.1 PCI Sound Card
Monitor(s) Displays
22 inch Lenovo L215 LCD/ SCEPTRE 37 inch LCD-HD (Movies)
Screen Resolution
1920X1080
Hard Drives
2X Seagate Barracuda 320GB 7200RPM
PSU
Cooler Master GX 650
Case
NZXT Lexa S, Crafted Gaming Armour Series
Cooling
2X140 exhaust on top, 1X120 exhaust the back, 2X120 intake
Driver sweeper also works well for cleaning out leftovers. Hope it takes care of it for you. Guru3D - Driver Sweeper
Edit- Run it in windows safe mode for best results and make sure to uninstall the drivers from add/remove programs in the control panel before running the cleaner