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...that DON'T require uninstallation of the Synaptics touchpad drivers (despite what some have said here, not all the functionality provided by the Synaptics drivers is retained when you uninstall - e.g. horizontal scrolling.)

Found it here:
http://www.dslreports.com/forum/rema...9361~mode=flat

Specifically, you just have to create a Registry Entry (I guess they forgot):

Quote:
Directed to the fix at the Synaptics website from the Dell forums. It was a driver issue, with a simple registry edit to get it straightened out. For anyone interested, it's:

HKLM\Software\Synaptics\SynTPEnh
AllowWheelSettings = REG_DWORD 1
Basically, add a new DWORD value at the above location, name it "AllowWheelSettings", and set the value to 1.

Now you can have your wheel mouse settings retained without having to uninstall the touchpad drivers.

(added)
Here's the link on the Synaptics website, with a .ini file that accomplishes the same thing:
http://www.synaptics.com/support/tro...ooting.cfm#9.0

Editing the registry by hand means you don't have to do the uninstall/reinstall/reboot twice thing...if you dare.

ed