[4wheelfurry]

Sorry for late reply,

HKLM/System/GWE

cxHcr
cxVcr
cyHScr
cyThMin
cyVScr

These are the 5 settings that determine the scrollbar size and up/dn button size. Set them all to 18 or 20 for a good usable size. If you want just the scrollbar and want the up/dn buttons to go away set the center 3 to 20 and the top and bottom to 0.
These settings apply to the horizontal scrollbar as well as vertical

This works on all 6.0,6.1,6.5,6.5.1 builds of WinMo for all devices.