Blue screen BCCode: a

Hi and welcome to SF

STOP 0x00000050: PAGE_FAULT_IN_NONPAGED_AREA

Usual causes: Defective hardware (particularly memory - but not just RAM), Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS
STOP 0x0000000A: IRQL_NOT_LESS_OR_EQUAL

Usual causes: Kernel mode driver, System Service, BIOS, Windows, Virus scanner, Backup tool, compatibility
STOP 0x0000004E: PFN_LIST_CORRUPT

Usual causes: Device driver, ?memory
STOP 0x0000008E: KERNEL_MODE_EXCEPTION_NOT_HANDLED

Usual causes: Insufficient disk space, Device driver, Video card, BIOS, Breakpoint in startup without having a debugger attached, Hardware incompatibility, Faulty system service, 3rd party remote control, Memory

I would suggest you to download third party called memtestx86, burn it to CD using http://isorecorder.alexfeinman.com/W7.htm , and let it run for at least 7 passes

Please remove any virtual CD program such as Deamon tool or Alcohol 120%, they use sptd.sys, which is known for causing BSOD. Use this tool to remove sptd.sys
DuplexSecure - Downloads

Do system file check:
SFC /SCANNOW Command - System File Checker

Code:

BugCheck 4E, {99, 35c5d, 2, 35c52}

Probably caused by : memory_corruption ( nt!MiBadShareCount+24 )

Followup: MachineOwner
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BugCheck A, {4020003, 2, 0, 82c3eaa3}

Probably caused by : ntkrpamp.exe ( nt!KiSignalSynchronizationObjectEx+1a )

Followup: MachineOwner
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BugCheck 50, {8c2f895a, 8, 8c2f895a, 2}

Probably caused by : ntkrpamp.exe ( nt!KiTrap0E+dc )

Followup: MachineOwner
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BugCheck 1000008E, {c000001d, 9244e1db, a36a8ac0, 0}

Probably caused by : hardware ( dxgkrnl+1c1db )

Followup: MachineOwner
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Regard,

Tuan

Do you mean an in-place installation without losing your information and files?.. but before we jump ahead we still need that dump file.

In-Place installation:
1) Insert the Windows 7 Installation Disc to your DVD-ROM drive. If AutoPlay pops up, click “Run setup.exe” directly.
2) Click “Install now” on the “Install Windows” screen.
3) In the “Get important updates for installation” screen, it is recommended to select the first option to download latest updates for installation, if Internet access is available.
4) Check the box “I accept the license terms” to agree with the installation license and click “Next”.
5) In the “Which type of installation do you want?” screen, click “Upgrade” to perform the In-Place upgrade.
6) Then, follow the wizard to finish the In-place Upgrade process.