Hello.Today my pc was working normally and i am running a windows XP SP3

I used it approximately for 6-7 hours.I installed the ie 8 update and later installed a scanner driver.The driver required a restart.. And that was it.

Every time now it is loading the windows it is automatically restarting after filling the blue bar on the bottom loading.After pressing F8 several times it loaded the boot page.(it didnt show this boot page automatically)

I tried everything ... safe mode , safe mode with no graphics , load using the good settings ... but nothing worked, all i am getting is just a black screen for 5-6 seconds and then a restart.

I really am stuck and in need of my pc and don't want to format it right now.Any body has a solution ? Appreciated.

PS.After choosing disable automatic restart im getting a blue screen an this message.

STOP:c00021a {Fatal Systen Error}

The Windows Logon Process System process terminated unexpectedly with a status of 0xc000139
(0x00000000 0x00000000)

The system has been shut down.