Are you having problems installing the latest (v17) version of Synaptics touchpad drivers in Windows 8.1? A number of people have run into problems due to an issue with the latest divers not being signed correctly. This is compounded by the fact that Synaptics don’t seem to make their older drivers available. I could not install v17.0.19 of the Synaptics driver.
After a lot of searching and experimenting, I managed to get the following driver to work. It contains the 32 & 64bit driver - v18.104.22.168.
Please note that the first time I tried to install it, only one of the two drivers installed correctly. I then restarted the system and ran setup again. The second time, both installed properly. I also ran setup as Administrator (right click, run as administrator) just in case.
I now have no problems with the touch pad and all works correctly. Previously I has issues with the touchpad freezing during busy times and randomly relocating to the top left.