well you do have the Conexant High Definition Audio
now this driver listed at toshiba seems to work on most old versions of this laptop so it should work on yours as well.
works with these models
Applicable Models: Satellite P100-ST7111, P100-ST7211, P100-ST9212, P100-ST9612, P100-ST9412, P100-ST1071, P100-ST9732, P100-ST9742, P100-ST9712, P100-ST9012, P105-S921, P105-S9312, P105-S6074, P105-S6034, P105-S6124, P105-S6114, P105-S6104, P105-S6102, P105-S9722, P105-S6062, P105-S6022, P105-S6084, P105-S6064, P105-S6134, P105-S6024, P105-S6054, P105-S6014, P105-S6004, P105-S6012, P105-S6002, P105-S931
please make sure you have loaded the following drivers before you load that conexant driver.
main chipset drivers for that motherboard which is the Intel 945GM Express
they can be found here.
microsoft unversal driver Download
direct x 9c