NO VIDEO ON DELL INSPIRON 1501!!! PLS HELP ME!!!

Question

After I installed a network card driver on my Dell Inspiron 1501 he restarting and now there is no video on lcd or external monitor. During the driver instalation on the screen appears something like "MAKING BIOS BACKUP .....". When I turn on the laptop it beeps three times: first a long bee and then two short beeps. After these beeps the HDD work fine because WINDOWS is loading (with this black screen) and I heard the WINDOWS startup sounds. Please excuse my poor english... Thank you!