STOP: 0x0000001A

SYSTEM_SERVICE_EXCEPTION
BCCode: 1a  0x0000001a  
http://www.faultwire.com/solutions-fatal_error/MEMORY-MANAGEMENT-0x0000001A

http://www.computerbase.de/forum/showthread.php?t=724846 
http://answers.microsoft.com/en-us/windows/forum/windows_7-system/bluescreen-stop-error-0x0000001a/f9b191b6-f2e7-4dff-8451-fd15e3f677a3

Mostly likely cause of this issue is defective or mismatched RAM (Random Access Memory). See if the problem exists with combinations as you swap it in and out.
Method 1: Run Memory Diagnostics test to check for any memory problems. Refer the below mentioned link for the same.
Diagnosing memory problems on your computer

Method 2:  Update the chipset, video card, display and network adapter drivers to the latest by visiting the computer manufacturer’s website.
Update a driver for hardware that isn't working properly
Update drivers: recommended links

Refer the below mentioned link for more information.
Resolving stop (blue screen) errors in Windows 7
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The main possible cause of all of those is memory probems though there can be other causes.
See the memory testing section in the next message.
Remove ALL power and reseat all cards, memory, and cables (both ends when possible) -
actually remove and replace - do not just snug. Make sure the vents are clear and that the
fans are working. Even though the temp is OK do not assume heat can't affect the video,
sound or other system functions it those get to hot. Try adding a small fan blowing into
the vents as a test. (Of course those are for a PC and not a laptop except the memory.)
Have you added any hardware lately? Have you updated any driver just before these started?
(Check Control Panel - Windows Updates to see if any drivers were updated there about the
time this started) Main likely culprits are Video driver, other major drivers, memory, and
antivirus/antispyware/security products could be at fault as well as drive issues.
Use the troubleshooter below and refer to the next message for drivers and memory when
you get to those sections and then return back to the troubleshooter as needed.
BCCode: 1a  0x0000001a  <-- br="" read="" this=""> http://www.faultwire.com/solutions-fatal_error/MEMORY-MANAGEMENT-0x0000001A-*1041.html?order=votes
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Look in the Event Viewer to see if anything is reported about those.
http://www.computerperformance.co.uk/vista/vista_event_viewer.htm
MyEventViewer - Free - a simple alternative to the standard event viewer of Windows.
TIP - Options - Advanced Filter allows you to see a time frame instead of the whole file.
http://www.nirsoft.net/utils/my_event_viewer.html
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Here are some methods to possibly fix the blue screen issue. If you could give the Blue Screen
info that would help. Such as the BCC and the other 4 entries on the lower left. And any other
error information such as STOP codes and info such as IRQL_NOT_LESS_OR_EQUAL or PAGE_FAULT_IN_NONPAGED_AREA and similar messages.
As examples :
BCCode: 116
BCP1: 87BC9510
BCP2: 8C013D80
BCP3: 00000000
BCP4: 00000002
or in this format :
Stop: 0x00000000 (oxoooooooo oxoooooooo oxooooooooo oxoooooooo)
tcpip.sys - Address 0x00000000 base at 0x000000000 DateStamp 0x000000000
This is an excellent tool for posting Blue Screen Error Information
BlueScreenView scans all your minidump files created during 'blue screen
of death' crashes, and displays the information about all crashes in one
table - Free
http://www.nirsoft.net/utils/blue_screen_view.html
Many BlueScreens are caused by old or corrupted drivers, especially video drivers however
there are other causes.
You can do these in Safe Mode if needed or from Command Prompt from Vista DVD or
Recovery Options if your system has that installed by the maker.
How to Boot to the System Recovery Options in Windows 7
http://www.sevenforums.com/tutorials/668-system-recovery-options.html
You can try a System Restore back to a point before the problem started if there is one.
How to Do a System Restore in Windows 7
http://www.sevenforums.com/tutorials/700-system-restore.html
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Start - type this in Search Box ->  COMMAND   find at top and RIGHT CLICK  -  RUN AS ADMIN
Enter this at the prompt - sfc /scannow
How to Repair Windows 7 System Files with System File Checker
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html
How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
generates in Windows Vista cbs.log (and Windows 7)
http://support.microsoft.com/kb/928228
The log might give you the answer if there was a corrupted driver. (Does not tell all the possible
driver issues).
Also run CheckDisk so we can rule out corruption as much as possible.
How to Run Check Disk at Startup in Windows 7
http://www.sevenforums.com/tutorials/433-disk-check.html
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Often updating drivers will help, usually Video, Sound, Network Card  (NIC), WiFi, 3rd party
keyboard and mouse, as well as other major device drivers.
Manually look at manufacturer's sites for drivers - and Device Maker's sites.
http://pcsupport.about.com/od/driverssupport/ht/driverdlmfgr.htm
How to Install a Device Driver in Vista Device Manager (also Windows 7)
http://www.vistax64.com/tutorials/193584-device-manager-install-driver.html
How To Disable Automatic Driver Installation In Windows Vista - Drivers
http://www.addictivetips.com/windows-tips/how-to-disable-automatic-driver-installation-in-windows-vista/
http://technet.microsoft.com/en-us/library/cc730606(WS.10).aspx
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How to fix BlueScreen (STOP) errors that cause Windows Vista to shut down or restart
unexpectedly
http://support.microsoft.com/kb/958233
Troubleshooting Vista Blue Screen, STOP Errors (and Windows 7)
http://www.chicagotech.net/vista/vistabluescreen.htm
Understanding and Decoding BSOD (blue screen of death) Messages
http://www.taranfx.com/blog/?p=692
Windows - Troubleshooting Blue Screen Errors
http://kb.wisc.edu/page.php?id=7033
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In some cases this might be required.
StartUp Repair from Recovery Options or Windows 7 disk
How to Run a Startup Repair in Windows 7
http://www.sevenforums.com/tutorials/681-startup-repair.html
How to Boot to the System Recovery Options in Windows 7
http://www.sevenforums.com/tutorials/668-system-recovery-options.html
How to Create a Windows 7 System Repair Disc
http://www.sevenforums.com/tutorials/2083-system-repair-disc-create.html
How to Do a Repair Install to Fix Windows 7
http://www.sevenforums.com/tutorials/3413-repair-install.html