Hello!
Assuming you are using a touchpad, the scroll bar appears at the right zone of your touchpad to use that as a scroll bar. You can turn that off by going to "Configuration Panel" --> "Mouse" --> "Hardware/Device Settings" (assuming you have a Synaptics touchpad. Then go to scrolling zones.
Could you please provide us more info about your PC? Here is how:
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UPDATE YOUR SEVENFORUMS SYSTEM SPECS
Go to your "User CP" (3rd item in the top menu bar)
In the left-hand column, under Your Profile, click "Edit System Spec".
Use
Speccy - System Information - Free Download
and/or
SIW to gather info for filling in the blanks.
"system manufacturer” block : please add if it is a Desktop or Laptop
Provide full windows version info, such as provided by Speccy:
MS Windows 7 Ultimate 64-bit SP1
Use the “Other Info” block for Optical Reader, Mouse, touchpad, wifi adapter, speakers, monitor
Scroll down and click on the SAVE CHANGES button.
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If you are using a desktop this is a whole other story.
I would also move this post to the "general questions" forum since this is a hardware issue and has nothing to do with theming/customization.
Grtz
Martin