What exactly did you uninstall from Toshiba? There were probably needed drivers you removed if you just picked random stuff to delete.
And you must have gotten the wrong video drivers, there is no way a laptop with i3 chip would have drivers from 2009, the i3 was not out then. The date I see for the display driver is from 1/18/2010
Drivers should be here http://support.toshiba.ca/support/isg/center/en/index.asp?s1=Notebook&s2=Satellite&s3=L500&s4=PSLS6C-00E005
, install the Chipset drivers first, then LAN, Audio and Video.