It works in BIOS but not Windows so maybe the drivers need updating. Install and run IOBit Driver Booster (see click here ). It will search for latest drivers for all of your laptop and it may find quite a few but, if everything else is working OK, only select the touch pad drivers for update. Of course you can update everything it finds but I am one of those "If it ain't broke don't fix it" guys. the choice is yours.
Incidentally why did you go back from Windows 8 to Windows 7? Extended support for W7 ends on 14th Jan 2020 while it ends on 10th Jan 2023 for W8 so you have lost 3 years of updates regarding security. Also the laptop components (track pad?) may have been designed to run on W8. If it was just because your uncle likes W7 and can't get used to W8 then all you needed to have done was install "Classic Shell" (see click here ) and W8 will operate like W7.
If you do go back to W8 make sure it is W8.1 and not W8. There is a whole world of difference. Then install Classic Shell. I have this setup and it is very stable and runs legacy programs better than W7 (in my case).
You should check the device manager to see if there is an error for the mouse driver. And I think when you install a system such as Windows 10, 8, 7, you should install the driver again, this can help all the devices get the perfect performance. And for the toshiba drivers, you can download it from here: click here