bsod startup repair error 0x0000007e Results

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Hi, I was surfing the web and watching videos when suddenly my laptop turned off and restarted. However, the restart was unsuccessful and I saw the BSOD. The blue screen didn't stay and the PC automatically started start up repair. It did not fix the problem. It gave me the option to go to the advance start up repair menu (I think that was what it was called). At the advance repair menu, I tried system restore (failed half way) and use sfc/ scannow in cmd(said system restore is in process need reboot to complete, but my PC cannot boot so everytime I restart I end up at the advance start up repair menu).

My laptop is Lenovo T420
64 bit
Windows 7 enterprise

Start up repair diagnostic - Unknown Bugcheck: Bugcheck 50. Parameters = 0xfffff8800415c000, 0x1, 0xfffff80002c816b1, 0x0.

Repair action : system files integrity check and repair
Result: Failed. Error code = 0x490
Time taken = 1795338 ms

*** STOP: 0x00000050 (0xFFFFF88003F5A000,0x0000000000000001,0XFFFFF80002C776, x0000000000000000)

seems like everytime I try to boot, the blue screen is different, these does not have error name
***STOP 0x0000007E (0xFFFFFFFFFC0000005, 0xFFFFFA80062A72C5,0xFFFFF88003F59628,0xFFFFF88003F58E80)

***STOP: 0x000000F4 (0x00000003, 0x82A88D40,0x82A88EAC,0x8C837D50)
recently, I had experienced the "window 7 antivirus 2012" virus twice but I delt with them by system restore

Please help me, I cannot access window and I'm running circle with startup repair option

Hi guys

Last night, while my download manager was set to shutdown after all complete and at 02 am, shutdown occured.
But today, it always gives that BSOD with stop: 0x0000007E at the boot up. I cant even start the safe mode, it always restarts in the bootup sequence. Windows7 startup repair only loads the last recovery point,but it does not help.

Tried returning back to my old Xp, but it says "I cant" because that partition was not something like Xp wanted.
So, I am completely stuck here.

edit: the error code is stop:0x0000007E (0xC0000005, 0x859EB787, 0x8B113210, 0x8B112DF0)

PS: I had borrowed my w7 dvd to a friend, so I dont have it right now.