There's this annoying popup video when using a Synaptics driver. It's titled SynNoButtons.wmv. Deleting the video creates other problems, but here is a more proper way to disable it.
On the task bar, there is a trackpad icon. Click this, then select TouchPad Properties. You should have this window:
Click on Tapping, then click on the gear icon. Here, make all actions No Zone.... Click OK.
The video shouldn't popup anymore.