1. In an search engine, search for Toshiba driver download as in the picture below and click on the highlighted link.

2. After the official Toshiba driver download page opens select your Toshiba product type and then fill up your product specifications (you will find them on your product) as shown  below.

3. After filling up product specification in the yallow highlighted zone (example below) click on search. You can see in the picture below the results for my example. Now download from the driver list the one you need.

Good luck!