PROBLEM with gta 4 mission escuela of the streets

[gunmaster099]

hi,

i need help im new to gta 4 pc im stuck on the mission escuela of the streets

there is a bug but i cant do nothing about ive tryed everything especially savegames but is says load fail check your hard drive

another problem is the patch 1.00.1 or somthin every time i install the patch its say fatal error plz reinstal game over and over again and ive install gta 4 every time ive also tryed the other patchs even the latest plz some1 help if u can!!!!!!!!!!!!!