is the G430 laptop a "Lenovo G430 laptop"?
there is a touchpad sensor button on the top right corner of the keyboard,
try turning that on,
Touchpad not working - Lenovo Community
if this doesn't work- try downloading the latest ALPS touchpad driver from Lenovo
else you should contact Lenovo Support
this is a common problem for all Lenovo Ideapad laptops
i have no idea if the touchpad can be changed,
please wait for others to make informed advice or recommendation
@TSPatange_1309
please do refrain from making useless and unneccessary posts