Hi Rhys,
As there is not a touchpad driver listed under Win 7 for your model try the Originally installed Vista driver. Rather than running the setup file update the driver for the PS/2 Compatible Mouse from within Device Manager.
Extract the files from the installation package to a known location.
Click Start > Control Panel.
Double click Device Manager.
Right click the device and select Properties
Click the Driver tab.
Click Update Driver.
Click Browse my computer for driver software.
Click Let me pick from a list...
Click Have Disk....
Click Browse and navigate to the folder where you placed the extracted files (synpd.inf is the file you should point to).
Click OK.
Click Next.
Click Finish.
Reboot your system if requested.
Rich