Windows 7 - Laptop trackpad problems after reinstall

I completely reinstalled Windows 7 on my Toshiba Satellite L455D, but when it was installing, I had a USB mouse plugged in. Now, my trackpad won't scroll when I run along the edge. When I look in the Device Manager, under Mice and other pointing devices, it says:
Do I need to install some sort of driver or reinstall? I've already tried right-clicking and selecting Scan for hardware changes. I found an article (link) on what I am looking for, only it was published in 2007. Help!
Tduck


System------------------------------------------------------------------------
Rating: 3.1 Windows Experience Index
Processor: AMD Sempron(tm) SI-42
Installed memory (RAM): 2.00 GB (1.75 GB usable)
System type: 32-bit Operating System
Pan and Touch: No Pen or Touch Input is available for this Display

Computer name, domain, and workgroup settings---------------------------------
Computer name: _________-Satellite-L455D
Full computer name: _________-Satellite-L455D
Computer description:
Workgroup: WORKGROUP

You will likely need to go to Toshiba's site and download the track pad drive. It is likely from Toshiba only. I couldn't get google to come up with Toshiba Satellite L455D, they have 4 more digits.