This has really got me scratching my head. Your model is A205-S5831, correct? If I go to Toshiba here:
Toshiba Support - Content List it lists the driver as ATI. If I google A205-S5831 video I get a lot of references to Intel. Wow Toshiba is confusing! Officially for the Go 7300 series, drivers are supplied by the OEM and not nvidia.
Take a look here, maybe one of these will work for you.
download from Guru3D.com