Your post was a couple years ago now, so you've probably long since figured this out, but for anyone else with a Satellite A215 with similar symptoms, I'll post what worked for me. My easy solution was to revert to the original driver.
I'd go crazy without touchpad scrolling, so this was a learning experience.
Like you, I had also just upgraded from Vista to 7. Fortunately, I had experienced something similar a couple months back (when I still had Vista) when I tried updating my drivers. After the driver update, the scrolling feature on the touch pad wouldn't work. I immediately reverted to the original driver (ALPS Pointing Device, Version 7.0.301.4) and it worked fine again. It almost seems like the Synaptics driver (the one I updated to) doesn't support scrolling, though how that can be, I don't know. Seems impossible.
After installing Windows 7 I purposely downloaded all the current drivers from Toshiba (Toshiba provides a handy "Toshiba Software Installer" for just such a purpose. Link here
, or just Google it). Everything else was working fine, but the scrolling function on the touch pad wouldn't work again. When I looked in Control Panel, Device Manager, I found the Synaptics touchpad driver. I immediately downloaded and installed the ALPS driver from the Toshiba website
and the scrolling feature worked fine again. I recall having to reboot a couple times, once to install the ALPS driver, another time to uninstall the Synaptics one.
At least on my computer, I never could find any kind of control panel for the touch pad, where you can control all the settings for tapping in the corners, scrolling (swiping) along the left or right, top or bottom, etc. The ALPS device seems to have just such a control panel, which is really handy. In Windows 7, you can find it by going to Control Panel, Hardware and Sound, Mouse. Click the Advanced tab, then Advanced Feature Settings button. Select the Touchpad tab, and you can then customize all the characteristics of your touchpad. When I had the Synaptics driver installed, I never could find such a feature, no matter how hard I looked in the same places. Odd.
It seems like different driver manufacturers may or may not include a dialog window where you can control the touch pad's settings. So, depending on what driver one is using, getting to the touch pad control panel may be different than described here.