When you look in Device Manager, is there any touchpad listed in the "Mice and other pointing devices" list? If not, you can probably visit the Lenovo website and download their latest available touchpad driver for your model.
If a touchpad is listed, but isn't working, try uninstalling the current driver & letting Windows Update (or Device Manager) find you a new driver.
Hopefully, that'll do it. There was a major Cumulative Update (KB3176938) released on Tuesday, perhaps that threw things off a bit.
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late edit: .... Ah, I see I type too slowly, once again :) .... glad it's fine now.