No doubt you've visited the Dell support site and found out that Dell does not provide any Windows 7 drivers for your laptop?
A 'driver' is a piece of software written to bridge a hardware item to a specific operating system.
If the MFGR (Dell) in this case has not written (or contracted to have it written) it's very difficult to find a driver that works.
You could find out who made the actual touchpad (Synaptics?) and see if they have a Win7 driver for your model of touchpad. But that's a long shot since they might not have any contracts to create a driver.
Your best (and maybe only) bet is to visit the Dell Community forums and see what other 8130 owners have been doing for Win 7 drivers.
I'm guessing a few of them are probably using a laptop type mouse.